Don't show branch heads in reflog subcommits

It's tricky to get this right for reflog commits wrt what's the current branch
for each one; so just disable it entirely here, it's probably not something
anybody needs here.

pkg/gui/controllers/switch_to_sub_commits_controller.go

@@ -11,6 +11,7 @@ var _ types.IController = &SwitchToSubCommitsController{}
 type CanSwitchToSubCommits interface {
 	types.Context
 	GetSelectedRef() types.Ref
+	ShowBranchHeadsInSubCommits() bool
 }
 
 type SwitchToSubCommitsController struct {
@@ -79,6 +80,7 @@ func (self *SwitchToSubCommitsController) viewCommits() error {
 	subCommitsContext.SetTitleRef(ref.Description())
 	subCommitsContext.SetRef(ref)
 	subCommitsContext.SetLimitCommits(true)
+	subCommitsContext.SetShowBranchHeads(self.context.ShowBranchHeadsInSubCommits())
 	subCommitsContext.ClearSearchString()
 	subCommitsContext.GetView().ClearSearch()