compose: Fix previews of /me messages.
compose: Fix previews of /me messages.

Previously, we didn't do anything special when previewing /me messages.

Fixes #2115.

hackerkid/zulip,eeshangarg/zulip,eeshangarg/zulip,brockwhittaker/zulip,Galexrt/zulip,mahim97/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,andersk/zulip,shubhamdhama/zulip,verma-varsha/zulip,rishig/zulip,Galexrt/zulip,verma-varsha/zulip,punchagan/zulip,hackerkid/zulip,verma-varsha/zulip,dhcrzf/zulip,Galexrt/zulip,dhcrzf/zulip,andersk/zulip,synicalsyntax/zulip,punchagan/zulip,timabbott/zulip,shubhamdhama/zulip,jackrzhang/zulip,dhcrzf/zulip,rht/zulip,andersk/zulip,amanharitsh123/zulip,dhcrzf/zulip,amanharitsh123/zulip,eeshangarg/zulip,jackrzhang/zulip,zulip/zulip,rishig/zulip,dhcrzf/zulip,tommyip/zulip,Galexrt/zulip,jackrzhang/zulip,synicalsyntax/zulip,tommyip/zulip,kou/zulip,showell/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,brainwane/zulip,brainwane/zulip,rishig/zulip,mahim97/zulip,brainwane/zulip,synicalsyntax/zulip,brockwhittaker/zulip,tommyip/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,andersk/zulip,shubhamdhama/zulip,shubhamdhama/zulip,amanharitsh123/zulip,rht/zulip,showell/zulip,jackrzhang/zulip,verma-varsha/zulip,brockwhittaker/zulip,punchagan/zulip,rht/zulip,dhcrzf/zulip,brainwane/zulip,brainwane/zulip,rht/zulip,rishig/zulip,mahim97/zulip,timabbott/zulip,timabbott/zulip,timabbott/zulip,kou/zulip,hackerkid/zulip,showell/zulip,jackrzhang/zulip,rishig/zulip,andersk/zulip,jackrzhang/zulip,synicalsyntax/zulip,jackrzhang/zulip,eeshangarg/zulip,mahim97/zulip,brockwhittaker/zulip,hackerkid/zulip,hackerkid/zulip,verma-varsha/zulip,showell/zulip,tommyip/zulip,synicalsyntax/zulip,kou/zulip,Galexrt/zulip,rishig/zulip,tommyip/zulip,dhcrzf/zulip,brockwhittaker/zulip,amanharitsh123/zulip,punchagan/zulip,amanharitsh123/zulip,andersk/zulip,punchagan/zulip,Galexrt/zulip,eeshangarg/zulip,rht/zulip,amanharitsh123/zulip,zulip/zulip,brainwane/zulip,synicalsyntax/zulip,kou/zulip,tommyip/zulip,timabbott/zulip,timabbott/zulip,eeshangarg/zulip,zulip/zulip,verma-varsha/zulip,timabbott/zulip,shubhamdhama/zulip,mahim97/zulip,showell/zulip,rishig/zulip,rht/zulip,showell/zulip,brainwane/zulip,zulip/zulip,tommyip/zulip,Galexrt/zulip,mahim97/zulip,punchagan/zulip,zulip/zulip,hackerkid/zulip,brockwhittaker/zulip,synicalsyntax/zulip,shubhamdhama/zulip,showell/zulip