test_escape: Fix output of --help

The short option name -f was not listed, only its long option name
--force-unsupported.

Author: Japin Li
Discussion: 
https://postgr.es/m/me0p300mb04452bd1fb1b277d4c1c20b9b6...@me0p300mb0445.ausp300.prod.outlook.com
Backpatch-through: 13

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9b1cb58c5f2127ddc682778b486739059ea2479d

Modified Files
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src/test/modules/test_escape/test_escape.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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