feedback: Generate the ticket number from the message ID.
feedback: Generate the ticket number from the message ID.

Signed-off-by: Anders Kaseorg <087231934ba8fcf78bc142ce37d193b895ac03c4@mit.edu>

hackerkid/zulip,showell/zulip,kou/zulip,shubhamdhama/zulip,synicalsyntax/zulip,punchagan/zulip,timabbott/zulip,punchagan/zulip,hackerkid/zulip,brainwane/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,showell/zulip,rishig/zulip,showell/zulip,andersk/zulip,kou/zulip,zulip/zulip,andersk/zulip,kou/zulip,tommyip/zulip,brainwane/zulip,zulip/zulip,zulip/zulip,hackerkid/zulip,shubhamdhama/zulip,rht/zulip,rishig/zulip,timabbott/zulip,rishig/zulip,eeshangarg/zulip,timabbott/zulip,hackerkid/zulip,tommyip/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,synicalsyntax/zulip,punchagan/zulip,kou/zulip,brainwane/zulip,brainwane/zulip,eeshangarg/zulip,showell/zulip,rht/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rht/zulip,shubhamdhama/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,showell/zulip,showell/zulip,punchagan/zulip,rishig/zulip,hackerkid/zulip,eeshangarg/zulip,tommyip/zulip,zulip/zulip,kou/zulip,rishig/zulip,punchagan/zulip,tommyip/zulip,tommyip/zulip,timabbott/zulip,rht/zulip,synicalsyntax/zulip,tommyip/zulip,rht/zulip,rishig/zulip,andersk/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,synicalsyntax/zulip,synicalsyntax/zulip,shubhamdhama/zulip,timabbott/zulip,timabbott/zulip,brainwane/zulip,andersk/zulip,timabbott/zulip,shubhamdhama/zulip,brainwane/zulip,synicalsyntax/zulip,eeshangarg/zulip,rishig/zulip