Drop a patch that cannot detect what it guards

`database_lines` reports through the connection the client already holds and
never calls `connect_lancedb`, so patching it detects nothing; `asked ==
[connection]` is what proves the reuse.

It was not merely dead. The patch was installed by name, and the next
`monkeypatch.setattr` triggered the first import of `haiku.rag.store.info`,
whose module body binds `connect_lancedb` — capturing the fake into a
namespace teardown does not restore, failing four `test_info` tests under
`-n0`.

tests/test_inspector.py

@@ -381,11 +381,6 @@ class TestReportingReusesTheConnection:
         from haiku.rag.inspector.widgets.info_modal import database_lines
         from haiku.rag.store.engine import ConnectionMode
 
-        def explode(*args, **kwargs):
-            raise AssertionError("opened a second connection to report statistics")
-
-        monkeypatch.setattr("haiku.rag.store.engine.connect_lancedb", explode)
-
         asked: list[object] = []
 
         async def fake_stats(db):