Revisit column widths in protected branches table

The following discussion from !18352 (merged) should be addressed:

• @pslaughter started a discussion: (+1 comment)

  issue (non-blocking): The "matching branches" text has an unfortunately word wrap. Are we sure we want to be setting the colgroup in _branches_list.html.haml

  Proposal:

  diff --git a/app/views/projects/protected_branches/shared/_branches_list.html.haml b/app/views/projects/protected_branches/shared/_branches_list.html.haml
  index 9dff251101b..e0e3681d5c7 100644
  --- a/app/views/projects/protected_branches/shared/_branches_list.html.haml
  +++ b/app/views/projects/protected_branches/shared/_branches_list.html.haml
  @@ -6,13 +6,6 @@
         = s_("ProtectedBranch|There are currently no protected branches, protect a branch with the form above.")
     - else
       %table.table.table-bordered
  -      %colgroup
  -        %col{ width: "20%" }
  -        %col{ width: "20%" }
  -        %col{ width: "20%" }
  -        %col{ width: "20%" }
  -        - if can_admin_project
  -          %col
         %thead
           %tr
             %th
  

  Before	After

  I'll create a follow up issue for this.