git: fix discard changes when deleting

[vince-fugnitto]

What it does

Fixes: #11531.

The pull-request fixes an issue where we are unable to discard changes for files which are newly created.
The issue was that we were not passing an array of URIs which the handler expected:

theia/packages/workspace/src/browser/workspace-commands.ts

Line 309 in 7b29ac6

registry.registerCommand(WorkspaceCommands.FILE_DELETE, this.newMultiUriAwareCommandHandler(this.deleteHandler));

theia/packages/workspace/src/browser/workspace-commands.ts

Lines 379 to 381 in 7b29ac6

	protected newMultiUriAwareCommandHandler(handler: UriCommandHandler<URI[]>): UriAwareCommandHandler<URI[]> {
	return UriAwareCommandHandler.MultiSelect(this.selectionService, handler);
	}

How to test

1. start the application with a workspace under version control (ex: theia)
2. create a new file (ex: touch a.txt)
3. open the scm-view and confirming discarding the file using the discard changes toolbar item works

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

Signed-off-by: vince-fugnitto vincent.fugnitto@ericsson.com

[paul-marechal]

Nice catch, LGTM.