Enable DotPosition cop

since Ruby 1.8.7 is no longer supported there is no need to disable this

Change-Id: I5a3382ce1f38423d5ffd34d71345b86e7de3f27e
Reviewed-on: http://gerrit.causes.com/37454
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>