test(inspec): no more need to mangle mapdata for hostname

We force the hostname in `kitchen` so the `_mapdata` files can be
static.

test/integration/default/controls/_mapdata_spec.rb

@@ -1,12 +1,7 @@
 # frozen_string_literal: true
 
-# Replace per minion strings
-replacement = {
-  hostname: system.hostname
-}
-
 mapdata_file = "_mapdata/#{system.platform[:finger].split('.').first}.yaml"
-mapdata_dump = inspec.profile.file(mapdata_file) % replacement
+mapdata_dump = inspec.profile.file(mapdata_file)
 
 control '`map.jinja` YAML dump' do
   title 'should contain the lines'