Fix global search in all tables

adminer/include/driver.inc.php

@@ -142,6 +142,14 @@ function add_driver($id, $name) {
 		return $idf;
 	}
 
+	/** Convert operator so it can be used in search
+	 * @param string $operator
+	 * @return string
+	 */
+	function convertOperator($operator) {
+		return $operator;
+	}
+
 	/** Convert value returned by database to actual value
 	* @param string
 	* @param array