Move hardcoded css styles in antispam filter classes to admin/style/default.css

[pascalc]

Style attributes are injected via php into the html in antispam filters, we should move that to a css class in admin/style/default.css, that will remove complexity in PHP and it will make it possible to update them in CSS

[pascalc]

ex:  https://bitbucket.org/dotclear/dotclear/src/5ceeeb6f545432dedf6fb9c4afb8b4cb6aac4023/plugins/antispam/filters/class.dc.filter.ip.php?at=default#cl-152

 https://bitbucket.org/dotclear/dotclear/src/5ceeeb6f545432dedf6fb9c4afb8b4cb6aac4023/plugins/antispam/filters/class.dc.filter.words.php?at=default#cl-19

[pascalc]

pull request:

 https://bitbucket.org/dotclear/dotclear/pull-request/46/ticket-1515-move-hardcoded-css-from/diff

[JcDenis]

http://dev.dotclear.org/2.0/changeset/ef727a109ce6195ab98b5d5c712db5692a3dc046