Debugger: Remove unreferenced QString arg

Change-Id: I6c7fd01d6bc8cee526fe1f566f9fae551246af80
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/qml/qmlengine.cpp

@@ -1126,7 +1126,7 @@ void QmlEngine::executeDebuggerCommand(const QString &command, DebuggerLanguages
         d->evaluate(command, CB(d->handleExecuteDebuggerCommand));
     } else {
         d->engine->showMessage(_("The application has to be stopped in a breakpoint in order to "
-                                 "evaluate expressions").arg(command), ConsoleOutput);
+                                 "evaluate expressions"), ConsoleOutput);
     }
 }