test/recipes/25-test_verify.t: correct the number of skipped tests on Win/VMS

test/recipes/25-test_verify.t: correct the number of skipped tests on Win/VMS

On 3.5, there is one test fewer to be skipped due to absence of support
of colon in filenames after the commit b3e7dad7ac08 "Fix
test/recipes/25-test_verify.t [3.5]", provide the correct number
in the skip call.

Fixes: b3e7dad7ac08 "Fix test/recipes/25-test_verify.t [3.5]"
Signed-off-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/28591)