使用组合键切换 ascii 时也能设置上屏

[gi-b716]

如题，在当前设置选段中，无法设置组合键例如 Ctrl+space 的上屏

ascii_composer:
  good_old_caps_lock: true  # true | false
  switch_key:
    Caps_Lock: clear      # commit_code | commit_text | clear
    Shift_L: commit_code  # commit_code | commit_text | inline_ascii | clear | noop | set_ascii_mode | unset_ascii_mode
    Shift_R: noop         # commit_code | commit_text | inline_ascii | clear | noop | set_ascii_mode | unset_ascii_mode
    Control_L: noop       # commit_code | commit_text | inline_ascii | clear | noop | set_ascii_mode | unset_ascii_mode
    Control_R: noop       # commit_code | commit_text | inline_ascii | clear | noop | set_ascii_mode | unset_ascii_mode

用 lua 自己写的 Ctrl+space 上屏脚本兼容性不是很好，望加入设置组合键的功能