fix: find unnamed cards and fit the served copy

An ArkOS or AmberELEC games part is named on the first screen and comes
first at the folder question. Packs that lack files are said so before
any plan. The served bootstrap gives advice that fits it, and the site
build refuses a copy whose pin is not its installer.

tests/test_install.py

@@ -4210,8 +4210,11 @@ class RunsAgainstTheRealLists(unittest.TestCase, _LoopbackRun):
         self.assertEqual(proc.returncode, 0, proc.stderr)
         lines = [line for line in proc.stdout.splitlines() if line.strip()]
         self.assertIn("Nothing was written", lines[-1])
-        header = next(line for line in lines if line.startswith("Would download"))
-        self.assertIn("data files", header)
+        at = next(index for index, line in enumerate(lines) if line.startswith("Would download"))
+        # One total on the header, the data files among the kinds under it
+        # (code_audit_21 P3-8).
+        self.assertNotIn("data files", lines[at])
+        self.assertIn("data files", lines[at + 1])
 
     def test_dest_alone_says_whose_list_it_is(self):
         proc = _install_run(self.env, "--dest", str(self.home / "card"), "--dry-run",