Project Organizer: Refresh should re-check base path

[chrisgraham]

If I change the current project's 'base path' setting, refreshing the project organizer should first re-read that setting before crawling the directory structure.

[techee]

Good catch. I've introduced this regression when I added support for external directories. It should actually not be needed to refresh the project manually after confirming the project settings dialog - it should be reloaded automatically for you. #921 should fix this bug.