Move Chrome Driver Version to Env

This will allow us to upgrade chrome driver easily. Set the default chrome driver to 2.32.

Also remove the comment and empty line to avoid getting below warning:

```
[WARNING]: Empty continuation lines will become errors in a future release.
```

env-example

@@ -56,6 +56,7 @@ WORKSPACE_INSTALL_TERRAFORM=false
 WORKSPACE_INSTALL_DUSK_DEPS=false
 WORKSPACE_PUID=1000
 WORKSPACE_PGID=1000
+WORKSPACE_CHROME_DRIVER_VERSION=2.32
 WORKSPACE_NODE_VERSION=stable
 WORKSPACE_YARN_VERSION=latest
 WORKSPACE_TIMEZONE=UTC