contib/nmbug/nmbug-status: leftover whitespaces, indentation & quoting

contib/nmbug/nmbug-status: leftover whitespaces, indentation & quoting

The initial nmbug-status was pretty consistent in it's whitespacing
but a few lines had some leftover slips. Those are now "corrected".

Also, most of the code used ' as quoting char. As in Python one can
use ' and " interchangeably some code used " instead of '. However
the usage of those were inconsistent. Now all quotes that python
parses are ':s (only quoted content uses ":s).

No functional changes.