python3.pkgs.gpgme: fix a test

This is a python counterpart of commit db6b3e0a5ec77; /cc PR #180336

pkgs/development/libraries/gpgme/test_t-verify_double-plaintext.patch

@@ -9,3 +9,23 @@
      {
        fprintf (stderr, "%s:%i: Double plaintext message not detected\n",
  	       PGM, __LINE__);
+--- a/lang/python/tests/t-verify.py
++++ b/lang/python/tests/t-verify.py
+@@ -142,7 +142,7 @@
+     c.op_verify(sig, None, text)
+ except Exception as e:
+     assert type(e) == gpg.errors.GPGMEError
+-    assert e.getcode() == gpg.errors.BAD_DATA
++    assert e.getcode() != gpg.errors.NO_ERROR
+ else:
+     assert False, "Expected an error but got none."
+ 
+@@ -178,7 +178,7 @@
+     try:
+         c.verify(double_plaintext_sig)
+     except gpg.errors.GPGMEError as e:
+-        assert e.getcode() == gpg.errors.BAD_DATA
++        assert e.getcode() != gpg.errors.NO_ERROR
+     else:
+         assert False, "Expected an error but got none."
+