Can't type the letter `i` in Notebooks when JupyterGIS is installed

[mfisher87]

I can't type the letter i into a Notebook when JupyterGIS is installed. There is no JupyterGIS document open, and both the left and right JupyterGIS panels are closed.

Looks like the "selector" logic for keybindings isn't working as expected! This was introduced in #581 , and reverting it resolves the problem.

[martinRenou]

That's pretty bad :D We should work on a fix today during the hackathon

[mfisher87]

Since we focused on something else at the hackathon today (#596), I'll open a PR to revert this change and re-open the issue to re-implement it once we've figured out the selector bug.