Adapt large browser window as default

We were really close to that anyway. It simplifies the code a bit.

spec/system/consumer/authentication_spec.rb

@@ -24,9 +24,7 @@ describe "Authentication" do
       before do
         visit root_path
       end
-      describe "as large" do
-        around { |example| browse_as_large { example.run } }
-
+      describe "with default large screen" do
         before do
           open_login_modal
         end

spec/system/consumer/multilingual_spec.rb

@@ -100,8 +100,6 @@ describe 'Multilingual' do
   end
 
   describe "using the language switcher UI" do
-    around { |example| browse_as_large { example.run } }
-
     context "when there is only one language available" do
       before do
         allow(ENV).to receive(:[]).and_call_original