Remove last opened functionality

This conflicts with our own handling of the last opened workspace.  If we wanted
to switch to this we would need to pass through the disable-last-opened flag and
respect it here then remove our own redirction code that handles this.

Our version might be better anyway since it puts the workspace in the URL.

Index: code-server/lib/vscode/src/vs/code/browser/workbench/workbench.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/code/browser/workbench/workbench.ts
+++ code-server/lib/vscode/src/vs/code/browser/workbench/workbench.ts
@@ -410,19 +410,6 @@ class WorkspaceProvider implements IWork
 				workspace = { folderUri: URI.revive(config.folderUri) };
 			} else if (config.workspaceUri) {
 				workspace = { workspaceUri: URI.revive(config.workspaceUri) };
-			} else {
-				workspace = (() => {
-					const lastWorkspaceRaw = window.localStorage.getItem(WorkspaceProvider.LAST_WORKSPACE_STORAGE_KEY);
-					if (lastWorkspaceRaw) {
-						try {
-							return parse(lastWorkspaceRaw); // use marshalling#parse() to revive potential URIs
-						} catch (error) {
-							// Ignore
-						}
-					}
-
-					return undefined;
-				})();
 			}
 		}