chore: reserve the restore-account alias

The frontend now serves /restore-account (the deletion cancel page),
so the alias namespace must never hand it out.

Author: Zingzy

shared/reserved_aliases.py

@@ -60,6 +60,7 @@
         "profile-pictures",
         "public",
         "register",
+        "restore-account",
         "relay",
         "report",
         "reset",