Database: Remove the check for sitecategories table on Database Repair screen.

The table is no longer created by core as of WordPress 3.0, and support for global terms was removed in WordPress 6.1, so `$wpdb->sitecategories` is unset by default.

This commit resolves a "passing null to non-nullable" deprecation notice on PHP 8.1:
{{{
Deprecated: addcslashes(): Passing null to parameter #1 ($string) of type string is deprecated in wp-includes/class-wpdb.php on line 1804
}}}

The `tables_to_repair` filter is available for plugins to readd the table or include any additional tables to repair.

Follow-up to [14854], [14880], [54240].

Props ipajen, chiragrathod103, SergeyBiryukov.
Fixes #57762.

git-svn-id: https://develop.svn.wordpress.org/trunk@55421 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/maint/repair.php

@@ -97,12 +97,6 @@
 
 	$tables = $wpdb->tables();
 
-	// Sitecategories may not exist if global terms are disabled.
-	$query = $wpdb->prepare( 'SHOW TABLES LIKE %s', $wpdb->esc_like( $wpdb->sitecategories ) );
-	if ( is_multisite() && ! $wpdb->get_var( $query ) ) {
-		unset( $tables['sitecategories'] );
-	}
-
 	/**
 	 * Filters additional database tables to repair.
 	 *