Fix #4388: Fixes nameerror issue in RecycleBoxLayout. (#4785)
Fix #4388: Fixes nameerror issue in RecycleBoxLayout. (#4785)

* Fixed nameerror in _update_sizes method.  Fixes #4388.

bionoid/kivy,jegger/kivy,rafalo1333/kivy,kivy/kivy,kived/kivy,jkankiewicz/kivy,janssen/kivy,janssen/kivy,matham/kivy,rafalo1333/kivy,kived/kivy,rnixx/kivy,LogicalDash/kivy,LogicalDash/kivy,akshayaurora/kivy,jkankiewicz/kivy,autosportlabs/kivy,kivy/kivy,akshayaurora/kivy,KeyWeeUsr/kivy,jkankiewicz/kivy,bionoid/kivy,bionoid/kivy,bionoid/kivy,KeyWeeUsr/kivy,matham/kivy,jegger/kivy,matham/kivy,manthansharma/kivy,KeyWeeUsr/kivy,tony/kivy,LogicalDash/kivy,tony/kivy,inclement/kivy,akshayaurora/kivy,rnixx/kivy,autosportlabs/kivy,jegger/kivy,Cheaterman/kivy,Cheaterman/kivy,LogicalDash/kivy,jkankiewicz/kivy,manthansharma/kivy,matham/kivy,kived/kivy,inclement/kivy,manthansharma/kivy,inclement/kivy,KeyWeeUsr/kivy,Cheaterman/kivy,kivy/kivy,autosportlabs/kivy,manthansharma/kivy,Cheaterman/kivy,janssen/kivy,rnixx/kivy,tony/kivy,rafalo1333/kivy,jegger/kivy,janssen/kivy