Remove obsolete CSS definitions.

The three attachment related definitions were moved into create_attachment.css in http://bzr.mozilla.org/bugzilla/4.2/revision/6777 which was then renamed to attachment.css in http://bzr.mozilla.org/bugzilla/4.2/revision/7049, and attachment.css *is* loaded anyway as can be seen in the source of https://bugzilla.wikimedia.org/attachment.cgi?id=1234&action=edit.

The two form#Create definitions were an old 1:1 copy from http://bzr.mozilla.org/bugzilla/4.2/view/6363/skins/standard/global.css and got removed in http://bzr.mozilla.org/bugzilla/4.2/revision/7219

.image_button got superseded in http://bzr.mozilla.org/bugzilla/4.2/revision/8073 and is unused.

tr.bz_row_odd on buglist.cgi is read from skins/standard/buglist.css anyway.

Bug: 54823
Change-Id: I43f5a7059d413ff1c7775bb32ef6d75a2f953c21
Merge "Remove obsolete CSS definitions."