Keybindings not working for vi command mode

[cohml]

After sourcing the plugin, the ^G^* keybindings work for emacs and viins modes. However the widgets aren't bound to anything in vicmd mode.

Fundamentally, this is because the zsh version of __fzf_git_init doesn't explicitly specify a mode for bindkey, which for vi mode users means all keybindings default to viins.

To fix this, minimally -M vicmd must be specified in its own call to bindkey.

Possibly related to #23. Nvm, I don't think so.