Don't skip bad words in Spell Query

[windymilla]

The SQ threshold stops words that appear lots of times from being reported as spelling errors. That check shouldn't apply to bad words, which should always be reported.

[windymilla]

Testing notes:
Create good_words.txt and bad_words.txt.
Put any word you like in the bad words file, e.g. xyz
Then open a text file in GG and add xyz in a few times (e.g. 3 times)
Also add 3 times another misspelling that is not in the bad words list, e.g. speelcheck
Run Tools->Spell Query
At the top of the dialog is a Threshold. When that is less than 3, and Spell Query is run, speelcheck should not appear, but xyz should (because it is bad). When the threshold is 3 or more, both speelcheck and xyz should appear.