DevTools: [Settings] Fix font size and alignment of the "Color format" setting label

This also fixes the "Indentation" setting label alignment

TBR=vsevik
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/18098008

git-svn-id: svn://svn.chromium.org/blink/trunk@154115 bbb929c8-8fbe-4397-9dbb-9b2b20218538