Fix crash when "NES with QuickNes" is selected, and the user attempts to load a FDS game without a proper FDS BIOS. Also, update the core statusbar label when bailing out of a failed Rom load attempt

BizHawk.Client.Common/RomLoader.cs

@@ -448,8 +448,7 @@ namespace BizHawk.Client.Common
 					// Specific hack here, as we get more cores of the same system, this isn't scalable
 					if (ex is LibQuickNES.UnsupportedMapperException)
 					{
-						LoadRom(path, nextComm, forceAccurateCore: true);
-						return true;
+						return LoadRom(path, nextComm, forceAccurateCore: true);
 					}
 					else
 					{

BizHawk.Client.EmuHawk/MainForm.cs

@@ -3187,6 +3187,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 			else
 			{
+				UpdateCoreStatusBarButton();
 				return false;
 			}
 		}