Remove bundler deprecation by using the right method

We want the environment before bundler was activated, so we can call
with_original_env.

test/support/application.rb

@@ -111,7 +111,7 @@ def spring_client_config
       def run(command, opts = {})
         start_time = Time.now
 
-        Bundler.with_clean_env do
+        Bundler.with_original_env do
           Process.spawn(
             env.merge(opts[:env] || {}),
             command.to_s,

test/support/application_generator.rb

@@ -31,7 +31,7 @@ def system(command)
       end
 
       def generate
-        Bundler.with_clean_env { generate_files }
+        Bundler.with_original_env { generate_files }
         install_spring
         generate_scaffold
       end