Fix MR approval by reporters

See
https://gitlab.com/gitlab-org/gitlab/-/issues/287795#note_591210032

It seems that requiring_code_owner_approval was added by mistake.

There were no such requirement in the original issue.

Changelog: fixed
EE: true

ee/app/policies/ee/merge_request_policy.rb

@@ -16,7 +16,6 @@ module EE
         project = @subject.target_project
         protected_branch = project
           .protected_branches
-          .requiring_code_owner_approval
           .find { |pb| pb.matches?(@subject.target_branch) }
 
         protected_branch.present? && group_access?(protected_branch)

ee/spec/policies/merge_request_policy_spec.rb

@@ -138,7 +138,7 @@ RSpec.describe MergeRequestPolicy do
   context 'for a merge request on a protected branch' do
     let(:branch_name) { 'feature' }
     let_it_be(:user) { create :user }
-    let(:protected_branch) { create(:protected_branch, project: project, name: branch_name, code_owner_approval_required: true) }
+    let(:protected_branch) { create(:protected_branch, project: project, name: branch_name) }
     let_it_be(:approver_group) { create(:group) }
 
     let(:merge_request) { create(:merge_request, source_project: project, target_project: project, target_branch: branch_name) }
@@ -195,7 +195,7 @@ RSpec.describe MergeRequestPolicy do
       end
 
       context 'when the protected branch name is a wildcard' do
-        let(:wildcard_protected_branch) { create(:protected_branch, project: project, name: '*-stable', code_owner_approval_required: true) }
+        let(:wildcard_protected_branch) { create(:protected_branch, project: project, name: '*-stable') }
 
         before do
           approval_project_rule.protected_branches << wildcard_protected_branch