fix: reset console pages in the index tests

A Sony fixture split by console recorded its pages in the shared map, and the index tests that ran after it linked PlayStation to the split page. They now start from an empty map, and the fixture clears it when done.

tests/test_site_r4_systems.py

@@ -288,12 +288,13 @@ class ConsolesFieldNamesMachinesOnce(unittest.TestCase):
         consumers = _consumers({})
         with gs.markup.using("mkdocs"):
             one = sum(len(line) + 1 for line in gs._system_file_card(big[0], consumers))
-        # Sega splits by size; every Sony console has a page whatever its size.
+        # Sega splits by size. Every Sony console has a page whatever its size.
         pages = gs.system_pages("Sega", {"Saturn": big, "Pico": small},
                                 consumers, budget=one * 12)
         self.assertIn("sega-saturn", pages)
         self.assertEqual(_consoles(pages["sega"][0]), ["Pico"])
         self.assertEqual(_consoles(pages["sega-saturn"][0]), ["Saturn"])
+        self.addCleanup(gs.reset_console_pages)
         sony = gs.system_pages("Sony", {"PlayStation": big, "PocketStation": small},
                                consumers, budget=one * 12)
         self.assertEqual(_consoles(sony["sony"][0]), [])