Fix SpaceBeforeModifierKeyword Rubocop warning

This also deals with some errant tabs where internal spaces should be,
as well as one syntax error which was preventing an old meterpreter
script from ever working correctly.

Some day, we need to get rid of those Meterpeter scripts. Srsly.

This is an experiment as a result of #3587. It's a small test, dealing with only a few issues. This is not blocked by #3587 at all, but if this lands, the `rubocop_todo.yml` should be updated to stop ignoring `SpaceBeforeModifierKeyword`.