Ignore order of remote branch names

Fixes a logic error in !2086 (merged).

For the ls_remote_branches experiment, we would log a warning if the branch names in the control differed from the branch names in the experiment.

However, if the arrays contained the same data (i.e., a successful experiment) but in a different order, the two arrays were considered different, but then when we calculated the difference, we ended up with an empty array, and ended up logging an erroneous warning message.

Now the ultimate diff is the deciding factor of whether or not we log. Two arrays of branch names with the same content but in different order will not log a warning message, as we originally intended.