Fix <enter> keybinding for switching to a worktree

The universal.confirm keybinding is the wrong one to use for this, we want
universal.goInto instead. They are both bound to "enter" by default, but when
remapping confirm to "y" we don't want to use that for entering worktrees.

pkg/gui/controllers/worktrees_controller.go

@@ -52,7 +52,7 @@ func (self *WorktreesController) GetKeybindings(opts types.KeybindingsOpts) []*t
 			DisplayOnScreen:   true,
 		},
 		{
-			Key:               opts.GetKey(opts.Config.Universal.Confirm),
+			Key:               opts.GetKey(opts.Config.Universal.GoInto),
 			Handler:           self.withItem(self.enter),
 			GetDisabledReason: self.require(self.singleItemSelected()),
 		},