Remove unnecessary monkey-patch of test helpers with Rails 5+

This is warning on Ruby 2.7, and seems unnecessary since Rails 5+
adopted kwargs approach. We still need to handle the difference for
Rails < 5 for now, while we support it (which I would like to remove
soon.)

test/support/http_method_compatibility.rb

@@ -5,19 +5,11 @@ class IntegrationTest < ActionDispatch::IntegrationTest
     # %w( get post patch put head delete xml_http_request
     #           xhr get_via_redirect post_via_redirect
     #         ).each do |method|
-    %w( get post put ).each do |method|
-      if Devise::Test.rails5_and_up?
-        define_method(method) do |url, options={}|
-          if options.empty?
-            super url
-          else
-            super url, options
-          end
-        end
-      else
-        define_method(method) do |url, options={}|
-          if options[:xhr]==true
-            xml_http_request  __method__, url, options[:params] || {}, options[:headers]
+    unless Devise::Test.rails5_and_up?
+      %w( get post put ).each do |method|
+        define_method(method) do |url, options = {}|
+          if options[:xhr] == true
+            xml_http_request __method__, url, options[:params] || {}, options[:headers]
           else
             super url, options[:params] || {}, options[:headers]
           end
@@ -30,19 +22,11 @@ class ControllerTestCase < ActionController::TestCase
     # %w( get post patch put head delete xml_http_request
     #           xhr get_via_redirect post_via_redirect
     #         ).each do |method|
-    %w( get post put ).each do |method|
-      if Devise::Test.rails5_and_up?
-        define_method(method) do |action, options={}|
-          if options.empty?
-            super action
-          else
-            super action, options
-          end
-        end
-      else
-        define_method(method) do |action, options={}|
-          if options[:xhr]==true
-            xml_http_request  __method__, action, options[:params] || {}, options[:headers]
+    unless Devise::Test.rails5_and_up?
+      %w( get post put ).each do |method|
+        define_method(method) do |action, options = {}|
+          if options[:xhr] == true
+            xml_http_request __method__, action, options[:params] || {}, options[:headers]
           else
             super action, options[:params] || {}, options[:headers]
           end