Create the OSM QtLocation plugin only once

Just loading that plugin already triggers an HTTP request, so lets only
do that when really needed and even more importantly, not for every single
location delegate again.

src/main.cpp

@@ -283,6 +283,7 @@ int main(int argc, char *argv[])
     qmlRegisterSingletonType("org.kde.neochat", 1, 0, "About", [](QQmlEngine *engine, QJSEngine *) -> QJSValue {
         return engine->toScriptValue(KAboutData::applicationData());
     });
+    qmlRegisterSingletonType(QUrl("qrc:/OsmLocationPlugin.qml"), "org.kde.neochat", 1, 0, "OsmLocationPlugin");
 
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     qRegisterMetaTypeStreamOperators<Emoji>();