ImageList: Fix HasImageIndex not being updated when ClearOverlays is called. Issue #35525, patch by Don Siders

git-svn-id: branches/fixes_2_0@63376 -

lcl/include/imglist.inc

@@ -1969,6 +1969,7 @@ var
 begin
   for I := Low(TOverlay) to High(TOverlay) do
     FOverlays[I] := -1;
+  FHasOverlays := false;
 end;
 
 procedure TCustomImageList.CreateDefaultResolution;