Don't show the pseudolocales unless we're in developer mode.

The old zz_ZY and zz_ZZ pseudolocales are gone, replaced by ar_XB and en_XA.
The existing check for "developer mode" wasn't working, and now the
pseudolocales are there by default, we want to _remove_ them if we're not
in developer mode rather than add them if we are in developer mode.

Bug: 17190407
Change-Id: I6ee6eba53f5b816ef8e0d1768c94cd3484a196b5