msglist: Fix DM header color lerp bug.#1336

gnprice merged 1 commit intozulip:mainzulip/zulip-flutter:mainfrom

E-m-i-n-e-n-c-e:lerpBugFixE-m-i-n-e-n-c-e/zulip-flutter:lerpBugFixCopy head branch name to clipboard