Add nested-form-container class in line_items/list_form.
Add nested-form-container class in line_items/list_form.

huerlisi/bookyt,xuewenfei/bookyt,silvermind/bookyt,gaapt/bookyt,hauledev/bookyt,silvermind/bookyt,wtag/bookyt,wtag/bookyt,huerlisi/bookyt,gaapt/bookyt,hauledev/bookyt,silvermind/bookyt,xuewenfei/bookyt,wtag/bookyt,huerlisi/bookyt,gaapt/bookyt,hauledev/bookyt,silvermind/bookyt,gaapt/bookyt,hauledev/bookyt,xuewenfei/bookyt