message: Add scenario files to fix build break.
  This CL is a follow-up to cl/491223708.
diff: 'suggest_after_zero_query.txt',
  'twelvekeys_switch_inputmode_scenario.txt',
  'twelvekeys_toggle_flick_alphabet_scenario.txt',
  - 'twelvekeys_toggle_hiragana_preedit_scenario.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_a.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ka.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_sa.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ta.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_na.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ha.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ma.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ya.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_ra.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_wa.txt',
  + 'twelvekeys_toggle_hiragana_preedit_scenario_symbol.txt',
  'undo.txt',
  'zero_query_suggestion.txt',
  ],
  