mypy: Disallow untyped/incomplete defs in all Python code

This previously applied only to the scuba package but now applies to
tests as well.

pyproject.toml

@@ -54,9 +54,6 @@ requires = [
 packages = ["scuba", "tests"]
 warn_unused_configs = true
 warn_return_any = true
-
-[[tool.mypy.overrides]]
-module = "scuba.*"
 disallow_untyped_calls = true
 disallow_untyped_defs = true
 disallow_incomplete_defs = true