Update theme/highlight.js with latest hardware.inc constants

[Rangi42]

highlight.js hard-codes lists of RGBDS and hardware.inc symbols to be highlighted. Recent hardware.inc updates have added some symbols, and the planned 5.0 update (gbdev/hardware.inc#58) would change many of them.

Note that none of hardware.inc's B/F bit number/flag constants are actually currently used anywhere in Pan Docs (git grep -Pnw '[A-Z0-9]+[BF]_[A-Z0-9_]+'), so none of the documentation itself needs updating.