software/headless-chromium: change _ to - in filename

software/headless-chromium/buildout.hash.cfg

 [template-cfg]
 filename = instance.cfg.in
-md5sum = 545f6bf83ca292e5807bad0cd82acdcb
+md5sum = 62b6430798f7bcb2e86a5c831045a7d1
 
 [instance-headless-chromium]
 _update_hash_filename_ = instance-headless-chromium.cfg.in

software/headless-chromium/instance.cfg.in

@@ -20,7 +20,7 @@ template-monitor = {{ template_monitor }}
 recipe = slapos.recipe.template:jinja2
 template = {{ template_instance_headless_chromium_target }}
 rendered = ${buildout:directory}/${:filename}
-filename = instance_headless-chromium.cfg
+filename = instance-headless-chromium.cfg
 context =
   section buildout buildout
   section parameter_list profile-common