tests: Use high enough number for invalid user group and user ids.
tests: Use high enough number for invalid user group and user ids.

We use 1111 for testing invalid user and user group id cases instead
of 25, since we may have a user group in 25 in test data in future.

rht/zulip,zulip/zulip,andersk/zulip,rht/zulip,rht/zulip,andersk/zulip,zulip/zulip,andersk/zulip,zulip/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip,rht/zulip,andersk/zulip,andersk/zulip,rht/zulip,zulip/zulip,zulip/zulip,rht/zulip,zulip/zulip