Made the keys section of settings_load more readable in settings.c

Just made the keys section of the code a little bit more readable.

Probably not necessary at all since the semantics are the same:

Compiled and ran on Ubuntu 14.04 on an amd64 architecture.

$ uname -a
Linux ThinkPad-T440s 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux