Crashpad: Explicitly enable crash_handler only for main app

That is the default, but this enables us to tweak the behavior in the
crash_handler correspondingly.

Change-Id: Ia580a580d4fb9ec8cfe90a3cb7c10471d86f3f41
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/app/main.cpp

@@ -444,6 +444,7 @@ void startCrashpad(const AppInfo &appInfo, bool crashReportingEnabled)
     annotations["sha1"] = Core::Constants::IDE_REVISION_STR;
 #endif
 
+    CrashpadInfo::GetCrashpadInfo()->set_crashpad_handler_behavior(crashpad::TriState::kEnabled);
     if (HostOsInfo::isWindowsHost()) {
         // reduces the size of crash reports, which can be large on Windows
         CrashpadInfo::GetCrashpadInfo()