Revert "component/firefox: compatibility for testnodes running too old erp5.util"

This reverts commit 80673c8c.

All testnodes should have been updated by now, so this commit is no
longer needed.

component/firefox/buildout.cfg

@@ -171,15 +171,3 @@ script =
   url, md5sum = self.options[guessPlatform()].split()
   extract_dir = self.extract(self.download(url, md5sum))
   shutil.copy(extract_dir + '/geckodriver', %(location)r)
-
-
-### BBB
-# testnodes are still using erp5-util.0.4.50 and are not looking for firefox in path
-# To be removed once testnode are updated to
-# https://lab.node.vifib.com/nexedi/slapos/raw/1.0.73/software/erp5testnode/software.cfg
-# or later
-[firefox-wrapper]
-location = ${firefox:location}/firefox-slapos
-
-[geckodriver]
-location = ${firefox:location}/geckodriver