custom_profile_fields: Remove redundant empty val set from edit form.
custom_profile_fields: Remove redundant empty val set from edit form.

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