Fix broken mappings in Denite

[Caleb Taylor]

Mappings that open files in new splits from normal mode in Denite are broken. User report:

CTRL + T from the denite fzf (LEADER + T) I get a "E73: tag stack empty"

[Vu Anh Duc]

In the nvim setting, he changed Leader key to ",". So I think you should try ",+t"

[Caleb Taylor]

This should be fixed now. The denite mappings changed so I had to update them to the new format.