Update 01-single-schema.t

https://github.com/PerlDancer/Dancer2/issues/417
Removed :tests in import (Dancer2 issue GH#417)
Removed :tests in import (Dancer2 issue GH#417)
Removed :tests in import (Dancer2 issue GH#417)
Removed :tests in import (Dancer2 issue GH#417)
Merge pull request #2 from scriplit/master

Removed :tests in import