Issue reported by chappg: if a monster or object covered an engraving,
examining that monster or object with farlook would include the text
of the engraving even though it wasn't the thing being examined.
The report was for a bones level but that only mattered because it was
a ghost on top of a grave (and the engraving on its headstone) that was
being examined; bones data itself wasn't pertinent. It would happen
with any engraving once the spot was mapped as an engraving or a grave
provided that something else was currently displayed at the location.
Bug was introduced by commit 389f03e90e
two months ago. Mea culpa.
Closes#1200
40e919dbf9