Showing the price of a shop object when examining it with '/' or ';'
didn't include a price if it was actually a mimic. This makes fake
objects have prices when appropriate, but it is only a partial fix
because moving away from a mimic causes nethack to forget the fake
object's dknown flag for most types of objects.
That could be solved by adding an mobj field to mon->mextra, which
will break save compatibility, or by adding a whole extra set of
object glyphs for object-with-dknown-set. The latter could probably
be done without breaking backwards save compatibility (new program
using old files) but it seems like more effort that it'd be worth and
it would break forwards save compatibility (old program attempting to
use new files--something we've never claimed to support).
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