Fix code generation for booking_template selection in line_item form.
Fix code generation for booking_template selection in line_item form.

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