Fix compatibility with MySQL 8 - error on 'system' table use

CHANGELOG

@@ -7,6 +7,7 @@ CHANGELOG Roundcube Webmail
 - Fix invalid regular expressions that throw warnings on PHP 7.3 (#6398)
 - Fix so Classic skin splitter does not escape out of window (#6397)
 - Fix XSS issue in handling invalid style tag content (#6410)
+- Fix compatibility with MySQL 8 - error on 'system' table use
 
 RELEASE 1.3.7
 -------------

SQL/mysql.initial.sql

@@ -209,4 +209,5 @@ CREATE TABLE `system` (
 
 /*!40014 SET FOREIGN_KEY_CHECKS=1 */;
 
-INSERT INTO system (name, value) VALUES ('roundcube-version', '2016112200');
+
+INSERT INTO `system` (`name`, `value`) VALUES ('roundcube-version', '2016112200');

SQL/postgres.initial.sql

@@ -288,4 +288,4 @@ CREATE TABLE "system" (
     value text
 );
 
-INSERT INTO system (name, value) VALUES ('roundcube-version', '2016112200');
+INSERT INTO "system" (name, value) VALUES ('roundcube-version', '2016112200');