Run as Groovy Script does not refresh classpath of existing launch config

[arysin]

1. Create groovy project
2. Add some jar dependencies to the project
3. Create groovy script
4. Run as Groovy Script
5. Update jar dependencies
6. Run as Groovy Script

The second run uses existing launch config and it has hardcoded classpath with old jars.

It would be nice to use project's classpath in the launch config to the jars referenced are always up to date with the project.