Check that returned user has roles

You can get undefined roles when the request succeeds but does not
return an actual user (like if you are trying to break the extension by
testing it with a non-Coder domain and you get a 200 and HTML back).
That might be a bug with the SDK actually but for now fix it here.

Author: code-asher

src/extension.ts

@@ -93,7 +93,7 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<void> {
   if (url) {
     getAuthenticatedUser()
       .then(async (user) => {
-        if (user) {
+        if (user && user.roles) {
           vscode.commands.executeCommand("setContext", "coder.authenticated", true)
           if (user.roles.find((role) => role.name === "owner")) {
             await vscode.commands.executeCommand("setContext", "coder.isOwner", true)