Improve monster list indicator for skipped monsters

This reverse-branded bit should be more visible than before.
Use, not simulate, reverse video
Recolor wizmode indicator not-blue (ChrisOelmueller)

Blue is for DGL messages.

Chris's original commit changed it to yellow, but that is the same
colour as the rest of the line (player name, etc).  Use lightmagenta
instead.  Also colour *EXPLORE*, and the player name in small-layout
local tiles, the same way.