Fix letter overlap in warning message

It was adjusting the spacing between letters through the height of the container surrounding the letters. If the font size is larger than height, the letters overlap. Therefore fix to adjust the spacing between letters with margin rather than height.

Bug: 303748201
Test: 1. Increase the font size as much as possible.
	2. Set the mobile time to 1 year ago to induce ssl failure.
	3. Connect to an AP that supports captiveportal.
	4. Check if the messages overlap.
Change-Id: I0efc74a05c4b6e0ff2c31cd87e5189e05f4bcca9
1 file changed