Fix update_message() in our API.
Fix update_message() in our API.

This was regressed in b3df1ddeb1bbf67695a673278ae3c4a3e7c9ae99.

jphilipsen05/zulip,rht/zulip,timabbott/zulip,punchagan/zulip,Galexrt/zulip,vabs22/zulip,kou/zulip,samatdav/zulip,rishig/zulip,kou/zulip,vaidap/zulip,synicalsyntax/zulip,samatdav/zulip,j831/zulip,PhilSk/zulip,zulip/zulip,ryanbackman/zulip,samatdav/zulip,verma-varsha/zulip,christi3k/zulip,amanharitsh123/zulip,shubhamdhama/zulip,dattatreya303/zulip,synicalsyntax/zulip,jackrzhang/zulip,kou/zulip,vaidap/zulip,aakash-cr7/zulip,susansls/zulip,JPJPJPOPOP/zulip,jrowan/zulip,jainayush975/zulip,andersk/zulip,jphilipsen05/zulip,eeshangarg/zulip,zulip/zulip,souravbadami/zulip,vabs22/zulip,andersk/zulip,jrowan/zulip,timabbott/zulip,showell/zulip,j831/zulip,shubhamdhama/zulip,andersk/zulip,shubhamdhama/zulip,sharmaeklavya2/zulip,susansls/zulip,dawran6/zulip,eeshangarg/zulip,zulip/zulip,brainwane/zulip,christi3k/zulip,amanharitsh123/zulip,zulip/zulip,shubhamdhama/zulip,dawran6/zulip,andersk/zulip,souravbadami/zulip,timabbott/zulip,timabbott/zulip,jainayush975/zulip,vaidap/zulip,brockwhittaker/zulip,amanharitsh123/zulip,showell/zulip,punchagan/zulip,showell/zulip,brainwane/zulip,aakash-cr7/zulip,PhilSk/zulip,SmartPeople/zulip,Galexrt/zulip,christi3k/zulip,mahim97/zulip,verma-varsha/zulip,dhcrzf/zulip,sharmaeklavya2/zulip,susansls/zulip,brainwane/zulip,SmartPeople/zulip,tommyip/zulip,tommyip/zulip,dawran6/zulip,susansls/zulip,jackrzhang/zulip,tommyip/zulip,jainayush975/zulip,sharmaeklavya2/zulip,blaze225/zulip,rht/zulip,timabbott/zulip,showell/zulip,kou/zulip,synicalsyntax/zulip,zulip/zulip,amanharitsh123/zulip,SmartPeople/zulip,sharmaeklavya2/zulip,souravbadami/zulip,rishig/zulip,souravbadami/zulip,vaidap/zulip,andersk/zulip,hackerkid/zulip,sharmaeklavya2/zulip,sharmaeklavya2/zulip,hackerkid/zulip,eeshangarg/zulip,dattatreya303/zulip,ryanbackman/zulip,rishig/zulip,vabs22/zulip,tommyip/zulip,sonali0901/zulip,jackrzhang/zulip,j831/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,PhilSk/zulip,eeshangarg/zulip,rishig/zulip,hackerkid/zulip,blaze225/zulip,punchagan/zulip,dattatreya303/zulip,souravbadami/zulip,jrowan/zulip,shubhamdhama/zulip,blaze225/zulip,punchagan/zulip,brainwane/zulip,dawran6/zulip,sonali0901/zulip,SmartPeople/zulip,brainwane/zulip,PhilSk/zulip,kou/zulip,susansls/zulip,synicalsyntax/zulip,souravbadami/zulip,dattatreya303/zulip,eeshangarg/zulip,rishig/zulip,rishig/zulip,hackerkid/zulip,sonali0901/zulip,dhcrzf/zulip,jackrzhang/zulip,dhcrzf/zulip,christi3k/zulip,dhcrzf/zulip,brockwhittaker/zulip,blaze225/zulip,Galexrt/zulip,vabs22/zulip,ryanbackman/zulip,tommyip/zulip,amanharitsh123/zulip,samatdav/zulip,brockwhittaker/zulip,sonali0901/zulip,vabs22/zulip,aakash-cr7/zulip,dhcrzf/zulip,mahim97/zulip,jrowan/zulip,samatdav/zulip,rht/zulip,amanharitsh123/zulip,verma-varsha/zulip,rishig/zulip,Galexrt/zulip,jphilipsen05/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,rht/zulip,timabbott/zulip,brockwhittaker/zulip,rht/zulip,Galexrt/zulip,JPJPJPOPOP/zulip,susansls/zulip,hackerkid/zulip,kou/zulip,brainwane/zulip,mahim97/zulip,jackrzhang/zulip,showell/zulip,punchagan/zulip,jackrzhang/zulip,JPJPJPOPOP/zulip,hackerkid/zulip,jphilipsen05/zulip,vabs22/zulip,sonali0901/zulip,mahim97/zulip,blaze225/zulip,jackrzhang/zulip,SmartPeople/zulip,ryanbackman/zulip,dhcrzf/zulip,dawran6/zulip,jrowan/zulip,aakash-cr7/zulip,eeshangarg/zulip,mahim97/zulip,kou/zulip,andersk/zulip,PhilSk/zulip,samatdav/zulip,brainwane/zulip,verma-varsha/zulip,hackerkid/zulip,verma-varsha/zulip,jainayush975/zulip,synicalsyntax/zulip,dhcrzf/zulip,SmartPeople/zulip,dattatreya303/zulip,Galexrt/zulip,rht/zulip,ryanbackman/zulip,shubhamdhama/zulip,tommyip/zulip,shubhamdhama/zulip,aakash-cr7/zulip,tommyip/zulip,j831/zulip,timabbott/zulip,dattatreya303/zulip,sonali0901/zulip,verma-varsha/zulip,zulip/zulip,jphilipsen05/zulip,JPJPJPOPOP/zulip,jainayush975/zulip,jrowan/zulip,jainayush975/zulip,brockwhittaker/zulip,j831/zulip,dawran6/zulip,brockwhittaker/zulip,christi3k/zulip,PhilSk/zulip,Galexrt/zulip,showell/zulip,ryanbackman/zulip,christi3k/zulip,jphilipsen05/zulip,mahim97/zulip,showell/zulip,andersk/zulip,vaidap/zulip,aakash-cr7/zulip,vaidap/zulip,blaze225/zulip,eeshangarg/zulip,zulip/zulip,punchagan/zulip,rht/zulip,j831/zulip,punchagan/zulip