sbt-scripted tests are ignored

[steinybot]

giter8.G8#templateFiles is excluding test files which means that any sbt-scripted tests in a template are ignored.

For example run:

sbt new sbt/sbt-autoplugin.g8

and note that this file is missing https://github.com/sbt/sbt-autoplugin.g8/blob/master/src/main/g8/src/sbt-test/%24name__norm%24/simple/test.