fix for header row not updating (#4576)

frappe/public/js/frappe/form/grid.js

@@ -480,8 +480,6 @@ frappe.ui.form.Grid = Class.extend({
 	},
 
 	setup_visible_columns: function() {
-		if(this.visible_columns) return;
-
 		var total_colsize = 1,
 			fields = this.editable_fields || this.docfields;