Themes: Prevent the Themes search field default action after [40572].

Props boonebgorges.
Fixes #41803.


git-svn-id: https://develop.svn.wordpress.org/trunk@41337 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/theme.js

@@ -105,7 +105,10 @@ themes.view.Appearance = wp.Backbone.View.extend({
 		view.render();
 		this.searchContainer
 			.append( $.parseHTML( '<label class="screen-reader-text" for="wp-filter-search-input">' + l10n.search + '</label>' ) )
-			.append( view.el );
+			.append( view.el )
+			.on( 'submit', function( event ) {
+				event.preventDefault();
+			});
 	},
 
 	// Checks when the user gets close to the bottom