Media: Revert r51211 to restore ms-files.php assets.

r51211 accidentally introduced a fatal error for Multisite instances with `ms_files_rewriting` enabled. Reverting removes the error, and the original purpose of the commit can be solved in another way.

Props otto42, barry, ryelle, azaozz.
Fixes #53492. See #53475.


git-svn-id: https://develop.svn.wordpress.org/trunk@51223 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/functions.php

@@ -3300,13 +3300,6 @@ function get_allowed_mime_types( $user = null ) {
 		unset( $t['htm|html'], $t['js'] );
 	}
 
-	// Add WebP if the server supports it.
-	unset( $t['webp'] );
-
-	if ( wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
-		$t['webp'] = 'image/webp';
-	}
-
 	/**
 	 * Filters list of allowed mime types and file extensions.
 	 *