Update upgrade.php

As per mdjnelson#681 (review)

Author: fulldecent

db/upgrade.php

@@ -316,24 +316,5 @@ function xmldb_customcert_upgrade($oldversion) {
         upgrade_plugin_savepoint(true, 2024042210, 'mod', 'customcert');
     }
 
-    if ($oldversion < 2025041401) {
-        $table = new xmldb_table('customcert');
-
-        // Add 'usecustomfilename' field.
-        $field = new xmldb_field('usecustomfilename', XMLDB_TYPE_INTEGER, '1', null, XMLDB_NOTNULL, null, '0', 'deliveryoption');
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // Add 'customfilenamepattern' field.
-        $field = new xmldb_field('customfilenamepattern', XMLDB_TYPE_TEXT, null, null, null, null, null, 'usecustomfilename');
-        if (!$dbman->field_exists($table, $field)) {
-            $dbman->add_field($table, $field);
-        }
-
-        // Savepoint reached.
-        upgrade_mod_savepoint(true, 2025041401, 'customcert');
-    }
-
     return true;
-}
+}