Custom preference node ,set wrong windows path.

[chakraborty-slx]

Bug Description:

Preference browser folder /file button is setting path string which is not Windows Path.

selection.path.toString() => '/x:/component_released/installs/nt64/test'

Should be
selection.path.fsPath() => 'X:\component_released\installs\nt64\test'

Steps to Reproduce:

Checkout 7b8d3b7

1. Open theia windows
2. Go to preference page
3. see use the browser button to select a folder

Additional Information

• Operating System: Windows 10
• Theia Version: v 1.25.0

[msujew]

@chakraborty-slx I added this particular issue to our tracker (see #10830). I'll close this issue in favor of fixing the other one.