patch 9.1.1452: completion: redundant check for completion flags

patch 9.1.1452: completion: redundant check for completion flags

Problem:  completion: redundant check for completion flags
Solution: refactor code slightly (glepnir)

refactor: nest fuzzy completion logic to avoid duplicate flag checks

- Combine COT_FUZZY checks into single nested condition
- Reduce redundant bitwise operations in ins_compl_new_leader()

closes: #17494

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