Improve images in the chatbar

- Don't show the hide button
- Shrink them to better fit
- Allow a little more maxh height in the chatbar for attachments
- Make sure that the button states work properly when adding and removing images

src/messagecontent/models/chatbarmessagecontentmodel.cpp

@@ -498,6 +498,7 @@ void ChatBarMessageContentModel::removeAttachment()
         mediaRow = 1;
     }
     removeComponent(mediaRow);
+    refocusCurrentComponent();
     if (m_room) {
         m_room->cacheForType(m_type)->setAttachmentPath({});
     }