user_profile_modal: Move profile avatar to the top on smaller screens.
user_profile_modal: Move profile avatar to the top on smaller screens.

Moving the profile avatar to the top on smaller screen sizes adds to
the general responsiveness of the profile modal.

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