Refactor project approvals param filter

ee/lib/api/project_approvals.rb

@@ -8,18 +8,16 @@ module API
     ARRAY_COERCION_LAMBDA = ->(val) { val.empty? ? [] : Array.wrap(val) }
 
     helpers do
-      def filter_params(params)
-        unless can?(current_user, :modify_merge_request_committer_setting, user_project)
-          params.delete(:merge_requests_disable_committers_approval)
-        end
-
-        unless can?(current_user, :modify_approvers_rules, user_project)
-          params.delete(:disable_overriding_approvers_per_merge_request)
+      def filter_forbidden_param!(permission, param)
+        unless can?(current_user, permission, user_project)
+          params.delete(param)
         end
+      end
 
-        unless can?(current_user, :modify_merge_request_author_setting, user_project)
-          params.delete(:merge_requests_author_approval)
-        end
+      def filter_params(params)
+        filter_forbidden_param!(:modify_merge_request_committer_setting, :merge_requests_disable_committers_approval)
+        filter_forbidden_param!(:modify_approvers_rules, :disable_overriding_approvers_per_merge_request)
+        filter_forbidden_param!(:modify_merge_request_author_setting, :merge_requests_author_approval)
 
         params
       end