Plugins: Properly encode query string s parameter in plugin search.

This ensures special characters like `&` are properly encoded when passed as URL parameter.

Props praful2111, audrasjb, costdev.
Fixes #56339.


git-svn-id: https://develop.svn.wordpress.org/trunk@53844 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/wp/updates.js

@@ -2535,7 +2535,7 @@
 
 			data = {
 				_ajax_nonce: wp.updates.ajaxNonce,
-				s:           event.target.value,
+				s:           encodeURIComponent( event.target.value ),
 				tab:         'search',
 				type:        $( '#typeselector' ).val(),
 				pagenow:     pagenow
@@ -2612,7 +2612,7 @@
 		$pluginSearch.on( 'keyup input', _.debounce( function( event ) {
 			var data = {
 				_ajax_nonce:   wp.updates.ajaxNonce,
-				s:             event.target.value,
+				s:             encodeURIComponent( event.target.value ),
 				pagenow:       pagenow,
 				plugin_status: 'all'
 			},