Replace files that don't work on review apps

qa/qa/specs/features/browser_ui/3_create/design_management/archive_design_content_spec.rb

@@ -15,7 +15,7 @@ module QA
       let(:third_design) do
         Resource::Design.fabricate! do |design|
           design.issue = second_design.issue
-          design.filename = 'tanuki.jpg'
+          design.filename = 'testfile.png'
         end
       end
 

qa/qa/specs/features/browser_ui/3_create/design_management/modify_design_content_spec.rb

@@ -5,7 +5,7 @@ module QA
     context 'Design Management' do
       let(:design) do
         Resource::Design.fabricate! do |design|
-          design.filename = 'tanuki.jpg'
+          design.filename = 'testfile.png'
         end
       end