Revert "[MM-8497] Ability to set Do Not Disturb for a specified period of time (#16067)" (#17657)

This reverts commit 77d42568f9.

api4/status.go

@@ -106,7 +106,7 @@ func updateUserStatus(c *Context, w http.ResponseWriter, r *http.Request) {
 	case "away":
 		c.App.SetStatusAwayIfNeeded(c.Params.UserId, true)
 	case "dnd":
-		c.App.SetStatusDoNotDisturbTimed(c.Params.UserId, status.DNDEndTime)
+		c.App.SetStatusDoNotDisturb(c.Params.UserId)
 	default:
 		c.SetInvalidParam("status")
 		return