Reduce the redundant signature_test

The file signature_test.py contained together with basic signature property
tests also an early form of the existence test, which is meanwhile
implemented in pyside2/tests/registry/existence_test.py .

This part is redundant in signature_test.py, and we remove it. The basic
signature tests stay, and the module is degraded from registry to a normal
test module in pyside2/tests/QtWidgets .

Remark: This simplification was found when I was finishing the
signature documentation. Instead of describing the intermediate state
of the module, it was more straight-forward to remove the duplication.

Task-number: PYSIDE-510
Change-Id: I7fbf65d6d2803926dc00485f1e82349912742942
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

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