Invalidate model filter when setting filter for QgsMapLayerComboBox, …

…fixes filters not correctly applying to layers in combo box (fix #10656)

src/gui/qgsmaplayerproxymodel.cpp

@@ -29,6 +29,7 @@ QgsMapLayerProxyModel::QgsMapLayerProxyModel( QObject *parent )
 QgsMapLayerProxyModel *QgsMapLayerProxyModel::setFilters( Filters filters )
 {
   mFilters = filters;
+  invalidateFilter();
   return this;
 }