lib: fix return value for n_directory_delete

Falling out of the catch meant the error return was lost

lib/directory.cc

@@ -323,7 +323,7 @@ notmuch_directory_delete (notmuch_directory_t *directory)
     }
     notmuch_directory_destroy (directory);
 
-    return NOTMUCH_STATUS_SUCCESS;
+    return status;
 }
 
 void

test/T563-lib-directory.sh

@@ -76,7 +76,6 @@ test_expect_equal_file EXPECTED OUTPUT
 
 backup_database
 test_begin_subtest "delete directory document for a closed db"
-test_subtest_known_broken
 cat c_head - c_tail <<'EOF' | test_C ${MAIL_DIR}
     {
         stat = notmuch_directory_delete (dir);