seleniumrunner: repair compatibility with erp5testnode

software/seleniumrunner/software.cfg

@@ -18,7 +18,8 @@ extends =
 parts =
    slapos-cookbook
    template
-
+   firefox-wrapper
+# seleniumserver needs to install a default firefox at ${buildout:bin-directory}/firefox for erp5testnode
 
 [instance-recipe]
 egg = slapos.cookbook

[Jérome Perrin]

This repairs a problem introduced with the merge of merging !420 (merged) that caused ERP5 tests not to run. It should be fixed from now on.