Correct manifest vs setup.py packages

All packages/*.py are automatically included so no need
to specify in manifest

Author: rogerbinns

MANIFEST.in

@@ -7,11 +7,6 @@ include src/apsw.docstrings
 # other files
 include apsw/__init__.pyi
 include apsw/py.typed
-include apsw/shell.py
-include apsw/speedtest.py
-include apsw/trace.py
-include apsw/tests/*.py
-include apsw/ext.py
 
 # data
 include apsw/fts_test_strings

setup.py

@@ -883,7 +883,7 @@ def get_icu_config() -> IcuConfig | None:
                 undef_macros=["NDEBUG"] if os.environ.get("UNICODE_DEBUG") else [],
             ),
         ],
-        packages=["apsw"],
+        packages=["apsw", "apsw.tests"],
         package_data={"apsw": ["__init__.pyi", "py.typed", "fts_test_strings"]},
         cmdclass={
             "test": run_tests,