wendelin: do not reuse sections with a 'recipe' option

This prevented from overriding 'erp5' without affecting the 'wendelin' itself.
Repository sections are often customized to disable cloning and make 'location'
point to an existing directory.

software/wendelin/software.cfg

@@ -68,7 +68,8 @@ list = ${erp5:location}/bt5 ${erp5:location}/product/ERP5/bootstrap ${wendelin:l
 jupyter-enable-default = true
 
 [wendelin]
-<= erp5
+recipe = slapos.recipe.build:gitclone
+git-executable = ${git:location}/bin/git
 repository = https://lab.nexedi.com/nexedi/wendelin.git
 branch = master