[🐴] Prevent flash upon first message (#4133)

* Prevent flash upon first message

* set `hasScrolled` to true when sending a message if it isn't already true

* revert other change

* lint

---------

Co-authored-by: Hailey <me@haileyok.com>

src/screens/Messages/Conversation/MessagesList.tsx

@@ -278,12 +278,16 @@ export function MessagesList({
         return true
       })
 
+      if (!hasScrolled) {
+        setHasScrolled(true)
+      }
+
       convoState.sendMessage({
         text: rt.text,
         facets: rt.facets,
       })
     },
-    [convoState, getAgent],
+    [convoState, getAgent, hasScrolled, setHasScrolled],
   )
 
   // -- List layout changes (opening emoji keyboard, etc.)