Update message bar styling in about:preferences#tor

The message bar on about:preferences#tor looks a little bit wonky post the proton updates. This is a minor issue and can be patched post-release.

• Screenshot: message-bar-11-0-a10

The styling of message bars themselves appears to have had a light update in Proton too. I suggest the following fixes:

1. Reduce the length of the string for (en) by removing the last four words:

Changes to Tor Network Settings will not take effect until you connect to the Tor Network

2. Update the message bar styling to match Firefox's newer chunkier styling:

• Interface mockups: Figma link

3. Improve the presentation with multiple rows of text, which will happen eventually on non (en) versions anyway:

• Component: Figma link