Fix T79616: Sort by column in filebrowser is broken

After changes in rBc606044157a3, mouse press events would be blocked by
the selection operator. This only worked by chance before.

source/blender/editors/space_file/file_ops.c

@@ -518,7 +518,7 @@ static int file_select_invoke(bContext *C, wmOperator *op, const wmEvent *event)
   rect.ymin = rect.ymax = event->mval[1];
 
   if (!ED_fileselect_layout_is_inside_pt(sfile->layout, &region->v2d, rect.xmin, rect.ymin)) {
-    return OPERATOR_CANCELLED;
+    return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
   if (sfile && sfile->params) {