patch 9.1.1315: completion: issue with fuzzy completion and 'completefuzzycollect'

patch 9.1.1315: completion: issue with fuzzy completion and 'completefuzzycollect'

Problem:  chain complete does not work when 'cot' includes fuzzy
          and 'completefuzzycollect' collects wrong next word.
          (Konfekt)
Solution: compl_startpos is not set correctly, remove next word check
          in search_for_fuzzy_match (glepnir).

fixes #17131
fixes #16942
closes: #17136

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>