settings_config: Use time_limit_dropdown_value for delete limit values.
settings_config: Use time_limit_dropdown_value for delete limit values.

Since, we removed the "never" option for edit-limit setting in
previous commits, we can now use same list for both edit-limit
and delete-limit setting values.

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