adapters don't need to set DebuggerNotReady state

src/plugins/debugger/gdb/attachgdbadapter.cpp

@@ -163,7 +163,6 @@ void AttachGdbAdapter::handleExit(const GdbResponse &response)
 void AttachGdbAdapter::handleGdbFinished(int, QProcess::ExitStatus)
 {
     debugMessage(_("GDB PROESS FINISHED"));
-    setState(DebuggerNotReady);
     emit adapterShutDown();
 }
 

src/plugins/debugger/gdb/coregdbadapter.cpp

@@ -212,7 +212,6 @@ void CoreGdbAdapter::handleExit(const GdbResponse &response)
 void CoreGdbAdapter::handleGdbFinished(int, QProcess::ExitStatus)
 {
     debugMessage(_("GDB PROESS FINISHED"));
-    setState(DebuggerNotReady);
     emit adapterShutDown();
 }
 

src/plugins/debugger/gdb/remotegdbadapter.cpp

@@ -280,7 +280,6 @@ void RemoteGdbAdapter::handleExit(const GdbResponse &response)
 void RemoteGdbAdapter::handleGdbFinished(int, QProcess::ExitStatus)
 {
     debugMessage(_("GDB PROESS FINISHED"));
-    setState(DebuggerNotReady);
     emit adapterShutDown();
 }
 

src/plugins/debugger/gdb/trkgdbadapter.cpp

@@ -1548,7 +1548,6 @@ void TrkGdbAdapter::handleGdbFinished(int exitCode, QProcess::ExitStatus exitSta
         emitDelayedAdapterStartFailed(msg);// Potentially emitted from QProcess::start() on Windows
     } else {
         logMessage(msg);
-        setState(DebuggerNotReady);
         emit adapterShutDown();
     }
 }