Administration: Fix radio button selection alignment.

Fix issue where the selected state dot on radio buttons was not centered when scaling is set to a value greater than 100%. Remove the `.tog` class and styles, unused since [26072].

Props presskopp, siliconforks, suhan2411, sabernhardt, shailu25, joedolson.
Fixes #64816.

git-svn-id: https://develop.svn.wordpress.org/trunk@62089 602fd350-edb4-49c9-b593-d223f7449a82