lightbox: Show compact view at 767px instead of 736px.
lightbox: Show compact view at 767px instead of 736px.

No regression is possible since are just doing adjustments to
make this view compact at a higher width.

zulip/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,zulip/zulip,punchagan/zulip,rht/zulip,rht/zulip,kou/zulip,kou/zulip,punchagan/zulip,rht/zulip,andersk/zulip,kou/zulip,zulip/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,zulip/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,hackerkid/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,punchagan/zulip,hackerkid/zulip