more spec fixes

app/views/projects/merge_requests/creations/_new_submit.html.haml

@@ -15,7 +15,6 @@
   = f.hidden_field :source_project_id
   = f.hidden_field :source_branch
   = f.hidden_field :target_project_id
-  = f.hidden_field :target_branch
 
 .mr-compare.merge-request.js-merge-request-new-submit{ 'data-mr-submit-action': "#{j params[:tab].presence || 'new'}" }
   - if @commits.empty?

app/views/shared/issuable/form/_branch_chooser.html.haml

@@ -17,7 +17,6 @@
     .issuable-form-select-holder
       = form.hidden_field(:target_branch,
         { class: 'target_branch js-target-branch-select ref-name',
-          id: '',
           disabled: issuable.new_record?,
           data: { placeholder: "Select branch", endpoint: refs_project_path(@project, sort: 'updated_desc', find: 'branches') }})
     - if issuable.new_record?