vim-patch:9.2.0380: completion: a few issues in completion code (#39264)

Problem: ins_compl_stop() sets compl_best_matches = 0, but that's a
         pointer, should reset compl_num_bests instead,
         find_common_prefix() reads cpt_sources_array[cur_source] without
         checking cur_source != -1 which causes an OOB for -1,
         find_next_completion_match(): second `if` in the pending loop
         should be `else if`. Forward paging only moves one step per call.

Solution: Reset compl_num_bests instead, add a check for cur_source not
          equal -1, change if to else if (glepnir)

closes: vim/vim#20000

https://github.com/vim/vim/commit/b328686d6a1eae1c519a0cdc0420c0d87b6d1fd1

Co-authored-by: glepnir <glephunter@gmail.com>

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