Flatten threads: minor improvements

- Scroll the reply box to the bottom, so the cursor is visible before
  composing the reply.
- Always show the "more" button in quotes when the user can't hover the
  quote box.

Bug: twpowertools:153
Change-Id: I26a03f3d3aaf8a278a7a641978dfd19274e4d356
diff --git a/src/contentScripts/communityConsole/flattenThreads/components/ReplyButton.js b/src/contentScripts/communityConsole/flattenThreads/components/ReplyButton.js
index 681c433..a5bf48d 100644
--- a/src/contentScripts/communityConsole/flattenThreads/components/ReplyButton.js
+++ b/src/contentScripts/communityConsole/flattenThreads/components/ReplyButton.js
@@ -92,6 +92,7 @@
           editor?.querySelector('.scTailwindSharedRichtexteditoreditor');
 
       payload.prepend(...this.#defaultReply(messagePayload.innerHTML));
+      payload.scrollTop = payload.scrollHeight;
     });
   }
 }