userChrome.css: Adapt to firefox 133 layout changes.

[mtwebster]

Ref #320

Testing

This change updates the userChrome.css file in your webapp's profile.

To try it, you can:

• Back up the current package's file:

$ cd /usr/share/webapp-manager/firefox/profile/chrome
$ sudo mv userChrome.css userChrome.css.bak

• Create the file with new contents:

> curl https://raw.githubusercontent.com/linuxmint/webapp-manager/ef8855f711bd4db7c74cb1e3d195cadda98b4e6f/usr/share/webapp-manager/firefox/profile/chrome/userChrome.css | sudo tee ./userChrome.css

• Then, start webapp-manager and Edit the webapp. Click Ok without any changes - this should update your webapp with the new userChrome.css file. Next time you open the webapp the fix should be applied.