Fix "session_minute" config setting validator

Version 1.63.1

Bugfix
Finished

Validator for session_minutes config parameter used to have bug. Trying to change this variable using command line used to result in: ``` > /usr/local/directadmin/directadmin set session_minutes 600 Error with the current values: Unknown type ir1:35791 when verifying session_minutes=600 ``` This issue is fixed and session_minutes can now be changed using CLI.

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