postgres_fdw: Remove redundant check in semijoin_target_ok()

If a var belongs to the innerrel of the joinrel, it's not possible that
it belongs to the outerrel.  This commit removes the redundant check from
the if-clause but keeps it as an assertion.

Discussion: 
https://postgr.es/m/flat/CAHewXN=8aW4hd_W71F7Ua4+_w0=bppuvvtebfbf6g0nusxl...@mail.gmail.com
Author: Tender Wang <tndrw...@gmail.com>
Reviewed-by: Alexander Pyhalov <a.yha...@postgrespro.ru>
Backpatch-through: 17

Branch
------
REL_17_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/c5cf99e9e52e99400654aa51fe6aa5a8e89bab6f

Modified Files
--------------
contrib/postgres_fdw/postgres_fdw.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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