Fix Ftreesit_parser_create

Fix Ftreesit_parser_create

* src/treesit.c (Ftreesit_parser_create): We recently changed something
such that base buffer and indirect buffer appears to use separate
parser-lists.  Therefore, creating a parser in one of the buffer
shouldn't reuse the parser in another buffer.

(cherry picked from commit f322905f6a31deb8da7f3d40a87e5ea097df5a73)