Remove redundant condition

We always generate example apps for >= 5.0.0 (4.2 is not in the matrix).

Author: pirj

example_app_generator/generate_app.rb

@@ -26,9 +26,7 @@
   gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.3.6'"
   gsub_file "Gemfile", /.*bootsnap.*/, ""
 
-  if Rails::VERSION::STRING >= '5.0.0'
-    append_to_file('Gemfile', "gem 'rails-controller-testing'\n")
-  end
+  append_to_file('Gemfile', "gem 'rails-controller-testing'\n")
 
   if Rails::VERSION::STRING >= '6'
     gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"