Revert "dict: add "mannor->manor""

From Jonathan Neuschäfer <j.neuschaefer@gmx.net>:

 This patch probably worth reverting.

 Since a "manor" is a type of "estate in land" [0], the word is
 practically found nowhere but in adventure games (I was reviewing
 codespell output of one when I found the word).

 GitHub search also suggests that reverting this patch is a good idea:
  manner: 470525 results
  manor:  9884   results (2.1% of the results for "manner")

 [0] http://en.wikipedia.org/wiki/Manor

This reverts commit 2329b456.