Coding Standards: Fix WPCS issues in wp-admin/plugin-editor.php and wp-admin/theme-editor.php.

See #49542.
Built from https://develop.svn.wordpress.org/trunk@47845


git-svn-id: http://core.svn.wordpress.org/trunk@47621 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/plugin-editor.php

@@ -221,7 +221,7 @@ $content = esc_textarea( $content );
 		<?php
 		foreach ( $plugins as $plugin_key => $a_plugin ) {
 			$plugin_name = $a_plugin['Name'];
-			if ( $plugin_key == $plugin ) {
+			if ( $plugin_key === $plugin ) {
 				$selected = " selected='selected'";
 			} else {
 				$selected = '';