Description of problem:
Dockerfile for dynamic-demo-plugin contains old/wrong path to its folder

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Inside console repository run build of Dockerfile.plugin.demo or Dockerfile.plugin.demo2
`docker build -f Dockerfile.plugins.demo2 -t jhadvig/console-demo-plugin:test .`
2.
3.

Actual results:
The build will fail cause the `console/frontend/dynamic-demo-plugin` was moved to 
`console/dynamic-demo-plugin`

Expected results:
The build will finish successfully 

Additional info:
```
docker build -f Dockerfile.plugins.demo2 -t jhadvig/console-demo-plugin:test .
Sending build context to Docker daemon    873MB
Step 1/8 : FROM node:10
 ---> 4ee0f07a0e63
Step 2/8 : COPY ./frontend/dynamic-demo-plugin/dist /opt/console-demo-plugin/static
COPY failed: stat /var/lib/docker/tmp/docker-builder259341973/frontend/dynamic-demo-plugin/dist: no such file or directory
```