Fix rendering of password mask chars in Chrome ext
Fix rendering of password mask chars in Chrome ext

The mask char literal was being rendered
incorrectly as the charset of the background
page was not set, although the charset of the panel
page had been set.

Set the charset for the Chrome extension background page
to UTF-8

robertknight/passcards,robertknight/passcards,robertknight/passcards,robertknight/passcards