Fix auditing tests

- following the change to remove '.' from component render calls, specifically the /attachment/_thumbnail ... .svg files, the component auditing tests were failing because it was now detecting those files renamed from .svg to .html.erb as components and including them as things that should be included in the component audit results
- modifying the code to remove the inclusion of the '/' character when detecting the component name fixes this problem, but raises the question why it was there in the first place, as all of our components should be in the top level dir and therefore never include a '/' character

app/models/govuk_publishing_components/audit_applications.rb

@@ -14,7 +14,7 @@ def initialize(path, name)
         stylesheets = Dir["#{path}/app/assets/stylesheets/**/*.scss"]
         javascripts = Dir["#{path}/app/assets/javascripts/**/*.js"]
 
-        find_components = /(?<=govuk_publishing_components\/components\/)[\/a-zA-Z_-]+(?=['"])/
+        find_components = /(?<=govuk_publishing_components\/components\/)[a-zA-Z_-]+(?=['"])/
 
         @find_all_stylesheets = /@import ["']{1}govuk_publishing_components\/all_components/
         find_stylesheets = /(?<=@import ["']{1}govuk_publishing_components\/components\/)(?!print\/)+[a-zA-Z_-]+(?=['"])/