Ensure sensitive data are removed when Windows app is uninstalled

Summary: This differential ensures that Comm Windows application data are deleted after uninstalling the app.

Test Plan:

1. Build Windows app.
2. Uninstall it.
3. Ensure AppData/Roaming/Comm folder is empty. Without this diff it would have all the data.

Reviewers: kamil, tomek, ashoat

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D13003