Remove now-unused prop `IMainFormForTools.OnPauseChanged`

fixes 7b904b171

src/BizHawk.Client.EmuHawk/IMainFormForTools.cs

@@ -40,9 +40,6 @@ namespace BizHawk.Client.EmuHawk
 		/// <remarks>only referenced from <see cref="PlaybackBox"/></remarks>
 		bool PressRewind { get; set; }
 
-		/// <remarks>only referenced from <see cref="GenericDebugger"/></remarks>
-		event Action<bool> OnPauseChanged;
-
 		BitmapBuffer CaptureOSD();
 
 		/// <remarks>only referenced from <see cref="TAStudio"/></remarks>

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -958,14 +958,11 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				_emulatorPaused = value;
-				OnPauseChanged?.Invoke(_emulatorPaused);
 			}
 		}
 
 		public bool BlockFrameAdvance { get; set; }
 
-		public event Action<bool> OnPauseChanged;
-
 		public string CurrentlyOpenRom { get; private set; } // todo - delete me and use only args instead
 		public LoadRomArgs CurrentlyOpenRomArgs { get; private set; }
 		public bool PauseAvi { get; set; }