Revert "gluon-luci-theme: remove top padding cbi-field-title"

This reverts commit f37f1f1ac2c9a44d0aafb25e3f5a01e16df6019e.
luci-theme: fix centering of form fields
luci-theme: fix checkboxes on firefox
Merge pull request #59 from freifunk-gluon/form-fields

luci-theme: fix centering of form fields