Updating ignores user-data-dir setting

[supereddie]

Issue Type: Bug

1. Add a launch parameter --user-data-dir "C:\TEMP\ads"
2. Delete 'standard' datadir @ %appdata%\azuredatastudio
3. Launch ADS (make sure an update is ready)
4. Update ADS

Expected: ADS starts after the update by respecting the --user-data-dir
Actual: ADS starts and uses %appdata%\azuredatastudio as it's data dir

This is realy annoying, as the default data dir is in the Roaming profile of my user account. This causes login/logout to take extremely long as it wants to sync the thousands of files in %appdata%\azuredatastudio.

Azure Data Studio version: azuredatastudio 1.9.0 (78a42e1, 2019-07-10T04:31:36.998Z)
OS version: Windows_NT x64 10.0.17763