Media: Reset the URL search parameter when the grid view search is cleared.

The throttled `input` handler in `wp.media.view.MediaFrame.Manage` only called `gridRouter.navigate()` when the search value was non-empty, so emptying the search box left the `?search=` query parameter in the address bar. Reloading the page then re-parsed that stale parameter and refilled the input. So now the `navigate()` method is called unconditionally when the input changes in order to reset the URL back to the base `upload.php`.

Developed in WordPress#11938.
Follow-up to r41021.

Props mohamedahamed, abduremon, jorbin, ekla, drwpcom, anukasha, huzaifaalmesbah, noruzzaman, rejaulalomkhan, hmbashar, nadabulija, robert681, pedrofigueroa1989, westonruter.
Fixes #65298.


git-svn-id: https://develop.svn.wordpress.org/trunk@62470 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/js/media/views/frame/manage.js

@@ -98,8 +98,9 @@ Manage = MediaFrame.extend(/** @lends wp.media.view.MediaFrame.Manage.prototype
 
 				if ( val ) {
 					url += '?search=' + val;
-					this.gridRouter.navigate( this.gridRouter.baseUrl( url ), { replace: true } );
 				}
+
+				this.gridRouter.navigate( this.gridRouter.baseUrl( url ), { replace: true } );
 			}, 1000 );
 
 		// Update the URL when entering search string (at most once per second).