Tiny optimization re: /obj/machinery/power/data_terminal/proc/is_valid_master

[Naksu]

This proc gets millions of calls, has no overrides and is simple enough to effectively be almost 100% proc call overhead in the profiles. In this branch I've replaced it with a #define macro.

https://github.com/goonstation/goonstati...t?expand=1

[pali6]

Merged.