streams: Reorder stream-privacy choices in UI.
streams: Reorder stream-privacy choices in UI.

This commit moves 'Web public' option to top in
the stream privacy choices in stream creation
form and changing privacy modal.

kou/zulip,andersk/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip,rht/zulip,andersk/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,andersk/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,kou/zulip,rht/zulip,zulip/zulip,zulip/zulip,kou/zulip