Fix #1600

Removed unnecessary `` which cause problems with pgsql.
https://github.com/mybb/mybb/issues/1600
Guys, please take this fight somewhere else. This is ridiculous. You're fighting over the possible misplacement of a closing parenthesis and a semi column....seriously? Omar, you don't want to start a fight yet you started one. Please think twice next time, we have other major issues to worry about.