Game script source dirs created after Klawr editor plugin starts are not watched for changes

[enlight]

Theoretically these steps would trigger the problem:

1. Open a project in UnrealEd with the Klawr editor plugin enabled, the project must not contain a Scripts directory.
2. Create a Scripts directory in the project root directory.
3. Add some C# files to the Scripts directory, by creating them outside UnrealEd or inside (while creating a new Klawr Blueprint for example).
4. The game scripts assembly will not be rebuilt or reloaded by the Klawr editor plugin since the new Scripts directory isn't being watched for changes.