fix: cite the reader that accepts the hash

A platform entry that declares a hash is now answered by the profile entries accepting it. Batocera's scph1001.bin (md5 dc2b9bf8, v2.0) cited DuckStation's bios.cpp:36, the v2.2 line. A same-named entry is kept, marked by name, only when none accepts the hash and its own hashes do not contradict it. Categories are unchanged: verify --all prints the same report.

tests/test_entry_categories.py

@@ -88,9 +88,11 @@ class Evidence(unittest.TestCase):
     def test_game_data_names_its_reader_and_reference(self):
         found = self.cats.explain({"name": "diabdat.mpq"}, "ports/diablo/diabdat.mpq", "diablo")
         self.assertEqual(found["category"], GAME_DATA)
+        # The platform entry declares no hash: the reader is matched by name.
         self.assertEqual(found["read_by"], [{
             "emulator": "devilutionx", "proof": "name", "runs_system": True,
-            "entries": [{"name": "diabdat.mpq", "source_ref": "Source/init.cpp:120"}]}])
+            "entries": [{"name": "diabdat.mpq", "source_ref": "Source/init.cpp:120",
+                         "by": "name"}]}])
         self.assertEqual(verify.category_evidence_text(found),
                          "read by devilutionx (diabdat.mpq at Source/init.cpp:120)")