gh-94998: Remove redundant condition in test_sqlite3/__main__.py (GH-95052)

(cherry picked from commit 9d09e7b0)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@protonmail.com>

Lib/test/test_sqlite3/__main__.py

 from test.test_sqlite3 import load_tests  # Needed for the "load tests" protocol.
 import unittest
 
-if __name__ == "__main__":
-    unittest.main()
+unittest.main()