lib: fix error return bug with n_d_set_config.

The catch block either needs to return, or the function needs to
return "status". Choose the latter for consistency with
n_d_get_config.

lib/config.cc

@@ -60,7 +60,7 @@ notmuch_database_set_config (notmuch_database_t *notmuch,
 	_notmuch_database_log (notmuch, "Error: A Xapian exception occurred setting metadata: %s\n",
 			       error.get_msg ().c_str ());
     }
-    return NOTMUCH_STATUS_SUCCESS;
+    return status;
 }
 
 static notmuch_status_t

test/T562-lib-database.sh

@@ -357,7 +357,6 @@ EOF
 test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "set config in closed database"
-test_subtest_known_broken
 cat c_head - c_tail <<'EOF' | test_C ${MAIL_DIR}
     {
         EXPECT0(notmuch_database_close (db));