Fixed incorrect default mount

Author: Chuxel

containers/docker-existing-docker-compose/.devcontainer/docker-compose.yml

@@ -23,7 +23,7 @@ services:
 
     volumes:
       # Update this to wherever you want VS Code to mount the folder of your project
-      - ..:/workspace
+      - .:/workspace
 
       # Uncomment the next line to use Docker from inside the container. See https://aka.ms/vscode-remote/samples/docker-in-docker-compose for details.
       # - /var/run/docker.sock:/var/run/docker.sock