GuiFilterCtrl: Rename identity function to resetFiltering to avoid clash

The field "identity" previously clashed with the method "identity"

Engine/source/gui/editor/guiFilterCtrl.cpp

@@ -89,7 +89,7 @@ DefineEngineStringlyVariadicMethod( GuiFilterCtrl, setValue, void, 3, 20, "(f1,
 	object->set(filter);
 }
 
-DefineEngineMethod( GuiFilterCtrl, identity, void, (), , "Reset the filtering."
+DefineEngineMethod( GuiFilterCtrl, resetFiltering, void, (), , "Reset the filtering."
 			  "@internal")
 {
    object->identity();