Remove unnecessary setSubCommits indirection

I don't know why this function argument was added, but I don't like unnecessary
indirections, so I'm removing it as SubCommitsHelper has access to everything it
needs to do it itself.

pkg/gui/controllers.go

@@ -90,12 +90,6 @@ func (gui *Gui) resetHelpersAndControllers() {
 		modeHelper,
 	)
 
-	setSubCommits := func(commits []*models.Commit) {
-		gui.Mutexes.SubCommitsMutex.Lock()
-		defer gui.Mutexes.SubCommitsMutex.Unlock()
-
-		gui.State.Model.SubCommits = commits
-	}
 	gui.helpers = &helpers.Helpers{
 		Refs:            refsHelper,
 		Host:            helpers.NewHostHelper(helperCommon),
@@ -135,7 +129,7 @@ func (gui *Gui) resetHelpersAndControllers() {
 		),
 		Search:     searchHelper,
 		Worktree:   worktreeHelper,
-		SubCommits: helpers.NewSubCommitsHelper(helperCommon, refreshHelper, setSubCommits),
+		SubCommits: helpers.NewSubCommitsHelper(helperCommon, refreshHelper),
 	}
 
 	gui.CustomCommandsClient = custom_commands.NewClient(

pkg/gui/controllers/helpers/sub_commits_helper.go

@@ -11,18 +11,15 @@ type SubCommitsHelper struct {
 	c *HelperCommon
 
 	refreshHelper *RefreshHelper
-	setSubCommits func([]*models.Commit)
 }
 
 func NewSubCommitsHelper(
 	c *HelperCommon,
 	refreshHelper *RefreshHelper,
-	setSubCommits func([]*models.Commit),
 ) *SubCommitsHelper {
 	return &SubCommitsHelper{
 		c:             c,
 		refreshHelper: refreshHelper,
-		setSubCommits: setSubCommits,
 	}
 }
 
@@ -73,3 +70,10 @@ func (self *SubCommitsHelper) ViewSubCommits(opts ViewSubCommitsOpts) error {
 	self.c.Context().Push(self.c.Contexts().SubCommits, types.OnFocusOpts{})
 	return nil
 }
+
+func (self *SubCommitsHelper) setSubCommits(commits []*models.Commit) {
+	self.c.Mutexes().SubCommitsMutex.Lock()
+	defer self.c.Mutexes().SubCommitsMutex.Unlock()
+
+	self.c.Model().SubCommits = commits
+}