Host: Remove unnecessary function

Remove Host_UpdateMainFrame(). The only non-empty call happened in
DolphinNoGUI which called s_update_main_frame_event.Set(), but
DolphinNoGUI never waits on that event.

Source/Android/jni/MainAndroid.cpp

@@ -163,10 +163,6 @@ void Host_JitProfileDataWiped()
 {
 }
 
-void Host_UpdateMainFrame()
-{
-}
-
 void Host_RequestRenderWindowSize(int width, int height)
 {
   std::thread jnicall(UpdatePointer);

Source/Core/Core/Core.cpp

@@ -242,8 +242,6 @@ bool Init(Core::System& system, std::unique_ptr<BootParameters> boot, const Wind
   INFO_LOG_FMT(BOOT, "Starting core = {} mode", system.IsWii() ? "Wii" : "GameCube");
   INFO_LOG_FMT(BOOT, "CPU Thread separate = {}", system.IsDualCoreMode() ? "Yes" : "No");
 
-  Host_UpdateMainFrame();  // Disable any menus or buttons at boot
-
   // Manually reactivate the video backend in case a GameINI overrides the video backend setting.
   VideoBackendBase::PopulateBackendInfo(wsi);
 
@@ -342,7 +340,6 @@ static void CPUSetInitialExecutionState(bool force_paused = false)
     bool paused = SConfig::GetInstance().bBootToPause || force_paused;
     SetState(system, paused ? State::Paused : State::Running, true, true);
     Host_UpdateDisasmDialog();
-    Host_UpdateMainFrame();
     Host_Message(HostMessageID::WMUserCreate);
   });
 }

Source/Core/Core/FifoPlayer/FifoPlayer.cpp

@@ -262,7 +262,6 @@ public:
 
       case CPU::State::Stepping:
         cpu.Break();
-        Host_UpdateMainFrame();
         break;
 
       case CPU::State::Running:

Source/Core/Core/Host.h

@@ -63,7 +63,6 @@ void Host_RequestRenderWindowSize(int width, int height);
 void Host_UpdateDisasmDialog();
 void Host_JitCacheInvalidation();
 void Host_JitProfileDataWiped();
-void Host_UpdateMainFrame();
 void Host_UpdateTitle(const std::string& title);
 void Host_YieldToUI();
 void Host_TitleChanged();

Source/Core/Core/State.cpp

@@ -456,8 +456,6 @@ static void CompressAndDumpState(Core::System& system, CompressAndDumpState_args
       Core::DisplayMessage(fmt::format("Saved State to {}", temp_path.filename().string()), 2000);
     }
   }
-
-  Host_UpdateMainFrame();
 }
 
 void SaveAs(Core::System& system, const std::string& filename, bool wait)

Source/Core/DolphinNoGUI/MainNoGUI.cpp

@@ -70,7 +70,6 @@ bool Host_UIBlocksControllerState()
   return false;
 }
 
-static Common::Event s_update_main_frame_event;
 void Host_Message(const HostMessageID id)
 {
   if (id == HostMessageID::WMUserStop)
@@ -94,11 +93,6 @@ void Host_JitProfileDataWiped()
 {
 }
 
-void Host_UpdateMainFrame()
-{
-  s_update_main_frame_event.Set();
-}
-
 void Host_RequestRenderWindowSize(int width, int height)
 {
 }

Source/Core/DolphinQt/Host.cpp

@@ -280,9 +280,6 @@ void Host_PPCBreakpointsChanged()
 // We ignore these, and their purpose should be questioned individually.
 // In particular, RequestRenderWindowSize, RequestFullscreen, and
 // UpdateMainFrame should almost certainly be removed.
-void Host_UpdateMainFrame()
-{
-}
 
 void Host_RequestRenderWindowSize(int w, int h)
 {

Source/Core/DolphinTool/ToolHeadlessPlatform.cpp

@@ -73,10 +73,6 @@ void Host_JitProfileDataWiped()
 {
 }
 
-void Host_UpdateMainFrame()
-{
-}
-
 void Host_RequestRenderWindowSize(int width, int height)
 {
 }

Source/DSPTool/StubHost.cpp

@@ -50,9 +50,6 @@ void Host_JitCacheInvalidation()
 void Host_JitProfileDataWiped()
 {
 }
-void Host_UpdateMainFrame()
-{
-}
 void Host_RequestRenderWindowSize(int, int)
 {
 }

Source/UnitTests/StubHost.cpp

@@ -50,9 +50,6 @@ void Host_JitCacheInvalidation()
 void Host_JitProfileDataWiped()
 {
 }
-void Host_UpdateMainFrame()
-{
-}
 void Host_RequestRenderWindowSize(int, int)
 {
 }