HP Kludge/Time-Bubble indicator broken in graphics mode

[flambard-took]

If time-bubble indicator decides it's time to use TERM_VIOLET, or if HP Kludge decides to change the char into 0-6, they go ahead and change the attr (or the char).

But in graphics mode, we can't change them separately, as the a/c pair is a reference into the tileset.

Ideally, those should get their own mappings in the xtra-xxx.prf, but for now, at least showing the correct text/attr would be good enough.