Remove non-test

This regression file didn't really test anything. The tests it was
supposed to do was removed here percona/pg_tde@e270322
So now it doesn't test anything that key_provider.sql doesn't already do
for us.

Author: AndersAstrand

contrib/pg_tde/Makefile

@@ -15,7 +15,6 @@ cache_alloc \
 change_access_method \
 insert_update_delete \
 key_provider \
-keyprovider_dependency \
 kmip_test \
 pg_tde_is_encrypted \
 recreate_storage \

contrib/pg_tde/expected/keyprovider_dependency.out

@@ -91,7 +91,6 @@ sql_tests = [
   'change_access_method',
   'insert_update_delete',
   'key_provider',
-  'keyprovider_dependency',
   'kmip_test',
   'pg_tde_is_encrypted',
   'relocate',