[BUGFIX] Missing separator in tables.sql

For the table sys_category_record_mm after the first KEY command there is
a missing comma which leads to dbal crash.

Change-Id: Ib5d88df46c166a9e7fffd5106e5158679cd947d8
Fixes: #43167
Release: 6.0
Reviewed-on: http://review.typo3.org/16628
Reviewed-by: Anja Leichsenring
Reviewed-by: Philipp Gampe
Reviewed-by: Wouter Wolters
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel

t3lib/stddb/tables.sql

@@ -660,6 +660,6 @@ CREATE TABLE sys_category_record_mm (
 	sorting int(11) DEFAULT '0' NOT NULL,
 	sorting_foreign int(11) DEFAULT '0' NOT NULL,
 
-	KEY uid_local_foreign (uid_local,uid_foreign)
+	KEY uid_local_foreign (uid_local,uid_foreign),
 	KEY uid_foreign_tablenames (uid_foreign,tablenames)
 );
\ No newline at end of file