test: align postgres precision error assertion text

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/test_bat025_portfolio_ledger_manual_metadata_migration.py

@@ -344,7 +344,7 @@ def test_dividend_large_integer_with_8dp_is_rejected_to_protect_double_snapshot(
     repo = _repo(isolated_settings)
     portfolio_id = _seed_portfolio(repo, "double-snapshot-guard")
 
-    with pytest.raises(ValueError, match="double snapshot precision"):
+    with pytest.raises(ValueError, match="DOUBLE PRECISION snapshot"):
         repo.record_manual_ledger(
             portfolio_id,
             action="DIVIDEND",