fix: use openFolder in welcomePage

In 1.56.2, they modified the WelcomePage use of OpenFileFolder in
src/vs/workbench/contrib/debug/browser/welcomeView.ts to only use on macOS +
Desktop (i.e. not Web). This caused the "Open Folder" to not work on macOS +
macOS-like environments.

Instead, we use OpenFolder which is a registered command and works as expected.

Author: jsjoeio

lib/vscode/src/vs/workbench/contrib/welcome/page/browser/vs_code_welcome_page.ts

@@ -20,7 +20,7 @@ export default () => `
 					<h2 class="caption">${escape(localize('welcomePage.start', "Start"))}</h2>
 					<ul>
 						<li><a href="command:workbench.action.files.newUntitledFile">${escape(localize('welcomePage.newFile', "New file"))}</a></li>
-						<li class="mac-only"><a href="command:workbench.action.files.openFileFolder">${escape(localize('welcomePage.openFolder', "Open folder..."))}</a> or <a href="command:git.clone">${escape(localize('welcomePage.gitClone', "clone repository..."))}</a></li>
+						<li class="mac-only"><a href="command:workbench.action.files.openFolder">${escape(localize('welcomePage.openFolder', "Open folder..."))}</a> or <a href="command:git.clone">${escape(localize('welcomePage.gitClone', "clone repository..."))}</a></li>
 						<li class="windows-only linux-only"><a href="command:workbench.action.files.openFolder">${escape(localize('welcomePage.openFolder', "Open folder..."))}</a> or <a href="command:git.clone">${escape(localize('welcomePage.gitClone', "clone repository..."))}</a></li>
 					</ul>
 				</div>