DBG: fixed a potential bug with running a script and then exiting x64_dbg

x64_dbg_dbg/simplescript.cpp

@@ -599,7 +599,11 @@ bool scriptcmdexec(const char* command)
 void scriptabort()
 {
     if(bIsRunning)
+    {
         bAbort=true;
+        while(bIsRunning)
+            Sleep(1);
+    }
     else //reset the script
         scriptsetip(0);
 }

x64_dbg_dbg/x64_dbg.cpp

@@ -253,6 +253,7 @@ extern "C" DLL_EXPORT const char* _dbg_dbginit()
 extern "C" DLL_EXPORT void _dbg_dbgexitsignal()
 {
     cbStopDebug(0, 0);
+    scriptabort();
     wait(WAITID_STOP); //after this, debugging stopped
     pluginunload();
     TerminateThread(hCommandLoopThread, 0);