Android: Ensure we forget the shortcut on next run.

Prevents an issue where we would use the shortcut param again when
starting the app directly.

UI/NativeApp.cpp

@@ -538,6 +538,7 @@ void NativeInit(int argc, const char *argv[], const char *savegame_dir, const ch
 	const char *stateToLoad = 0;
 
 	bool gotBootFilename = false;
+	boot_filename = "";
 
 	// Parse command line
 	LogTypes::LOG_LEVELS logLevel = LogTypes::LINFO;