When "zoom text only" is checked in Firefox, some icons do not scale

[sbates-idrc]

When the "zoom text only" option under settings > zoom is checked in Firefox, some icons do not scale as expected, including the character. Other icons, such as the audio toggle, do scale, so obviously we managed to add styles to ensure that some things scale even with the setting turned on.

Original Jira issue: https://fluidproject.atlassian.net/browse/C2LC-442