Fix warning in main function

main could according to the compiler end up not returning. of course it will always return, but I satisfied the compiler by adding a default case.

Signed-off-by: Tayou <tayou@gmx.net>

launcher/main.cpp

@@ -91,5 +91,7 @@ int main(int argc, char *argv[])
         return 1;
     case Application::Succeeded:
         return 0;
+    default:
+        return -1;
     }
 }