hellaswagの few-shot examples を修正

[Ktakuya332C]

今のhellaswagの few-shot examples はcontextとcontinuationの間にスペースが2つ含まれていそうです

例1: woman<space><space>stands
A man in a black vest is standing in a room. He throws darts at a dart board on the wall. a woman  stands next to him watching.
例2: shaper<space><space>is
Several food items and dishes are laid out on a table. Meat product and other items are used to create a sandwich. then a bento shaper  is used to create an image in the sandwich.

whilte_space_before_choiceによって追加される一つと

flexeval/flexeval/preset_configs/EvalSetup/en_multiple_choice/hellaswag.jsonnet

Line 15 in fb507d8

whitespace_before_choices: true,

prompt_templateによって追加される一つの合計2つです。

前者は必要だと思うので、後者を削除します。

[ryosukeiri]

LGTM!!