:w and :wa don't work properly with SSHFS and LiveShare guest

[wilbur4321]

Describe the bug
:w produces an "ENOENT: no such file or directory, access C:..." when you are saving a file opened through the SSHFS extension. :wa works with this extension. Ctrl-S to save works as well.

With VS LiveShare (as a guest), both show success, but they appear to just write to the local file, and not save on the server. Again, Ctrl-S works properly.

To Reproduce
Steps to reproduce the behavior:

Add the "SSH FS" extension from https://marketplace.visualstudio.com/items?itemName=Kelvin.vscode-sshfs. Configure a remote connection and add it to your workspace. Open a file within, and observe the above behavior when using :w.

Configure LiveShare. Share your session (the system doing the sharing doesn't even need VSCodeVim). Connect to LiveShare from a VSCode with VSCodeVim (aka, client). Open the same file on both, make a change in the client, use :w to save, and observe that the other system shows the file as not having been written. Now, use Ctrl-S to save, and observe that the other system shows the file as having been written.

Expected behavior
:w should write the file the same as Ctrl-S. :wa should do the same as a save-all.

Environment (please complete the following information):

• Issue Type: Bug
• Extension Name: vim
• Extension Version: 0.17.0
• OS Version: Windows_NT x64 10.0.17134
• VSCode version: 1.30.1

{
	"activationTimes": {
		"startup": true,
		"codeLoadingTime": 188,
		"activateCallTime": 0,
		"activateResolvedTime": 998,
		"activationEvent": "*"
	}
}

[jpoon]

Closing as duplicate of #2956

[wilbur4321]

Sorry about the duplicate, and thanks for the fix! I greatly appreciate it!! 👍