Explorer tree filter doesn't work with vim.disableExtension set to true

[Yanpas]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Set vim.disableExtension to true
2. Select some filder in explorer and start typing
3. Autofilter is not triggered

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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If remapping-related, please attach log output: https://github.com/VSCodeVim/Vim#debugging-remappings.

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.8.1
• VSCode version: 1.35.1
• OS: linux

Additional context
Add any other context about the problem here.

[Yanpas]

To trigger filtering I have to enter /