Media: Remove unused `$is_IE` and `$is_opera` globals in `media_upload_form()`.

Follow-up to [27316].

Props upadalavipul.
See #59254.
Built from https://develop.svn.wordpress.org/trunk@56504


git-svn-id: http://core.svn.wordpress.org/trunk@56016 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/media.php

@@ -2083,13 +2083,11 @@ function media_upload_header() {
  *
  * @global string $type
  * @global string $tab
- * @global bool   $is_IE
- * @global bool   $is_opera
  *
  * @param array $errors
  */
 function media_upload_form( $errors = null ) {
-	global $type, $tab, $is_IE, $is_opera;
+	global $type, $tab;
 
 	if ( ! _device_can_upload() ) {
 		echo '<p>' . sprintf(

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56503';
+$wp_version = '6.4-alpha-56504';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.