Use a standard exception when a cia fails to be installed

Author: CasualPokePlayer

src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Encore.cs

@@ -160,7 +160,7 @@ public Encore(CoreLoadParameters<EncoreSettings, EncoreSyncSettings> lp)
 						throw new CIAInstallThrowable("The update CIA was successfully installed.");
 					}
 
-					throw new CIAInstallThrowable(outMsg);
+					throw new Exception(outMsg);
 				}
 			}