Fix RubyStyle specs to be 1.8.7-compliant

This was missed in 2fdedf1.

Change-Id: I3093327cb2003f44e697a6f5e52acb45f9b767c1
Reviewed-on: https://gerrit.causes.com/30479
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>