Get rid of error return value of PostRefreshUpdate and a few related ones

I missed these in https://github.com/jesseduffield/lazygit/pull/3890.

pkg/gui/controllers/helpers/cherry_pick_helper.go

@@ -57,7 +57,8 @@ func (self *CherryPickHelper) CopyRange(commitsList []*models.Commit, context ty
 		}
 	}
 
-	return self.rerender()
+	self.rerender()
+	return nil
 }
 
 // HandlePasteCommits begins a cherry-pick rebase with the commits the user has copied.
@@ -120,7 +121,8 @@ func (self *CherryPickHelper) Reset() error {
 	self.getData().ContextKey = ""
 	self.getData().CherryPickedCommits = nil
 
-	return self.rerender()
+	self.rerender()
+	return nil
 }
 
 // you can only copy from one context at a time, because the order and position of commits matter
@@ -136,16 +138,12 @@ func (self *CherryPickHelper) resetIfNecessary(context types.Context) error {
 	return nil
 }
 
-func (self *CherryPickHelper) rerender() error {
+func (self *CherryPickHelper) rerender() {
 	for _, context := range []types.Context{
 		self.c.Contexts().LocalCommits,
 		self.c.Contexts().ReflogCommits,
 		self.c.Contexts().SubCommits,
 	} {
-		if err := self.c.PostRefreshUpdate(context); err != nil {
-			return err
-		}
+		self.c.PostRefreshUpdate(context)
 	}
-
-	return nil
 }