fix icon and add display_name

vscode-desktop/main.tf

@@ -19,8 +19,9 @@ data "coder_workspace" "me" {}
 resource "coder_app" "vscode" {
   agent_id     = var.agent_id
   external     = true
-	icon = "/icons/code.svg"
+  icon         = "/icon/code.svg"
   slug         = "vscode"
+  display_name = "VS Code Desktop"
   url = join("", [
     "vscode://coder.coder-remote/open?owner=",
     data.coder_workspace.me.owner,