pluginmodel: remove moc warning

pluginmodel.cpp has no private class declaration.

Change-Id: I67b6bba1c32101116e0a3d9ca208535c0a2ba1b2

src/pluginmodel.cpp

@@ -249,6 +249,3 @@ PluginModel::resetPluginPreferencesValues(const QString& path)
 }
 
 } // namespace lrc
-
-#include "api/moc_pluginmodel.cpp"
-#include "pluginmodel.moc"