Fix sql(params_inline=True) not inlining subquery filter values

[worksbyfriday]

Summary

Fixes #1800

Subquery.get_sql() unconditionally called get_parameterized_sql(), which creates a new Parameterizer even when the outer context expects inline values. This caused subquery filter values to be rendered as ? placeholders instead of being inlined.

The fix checks whether the SqlContext has an active parameterizer:

• If yes (parameterized mode): use get_parameterized_sql() so values are collected into the outer query's parameterizer
• If no (inline mode): use get_sql() so values are rendered directly

Before

query = MyModel.filter(id__in=Subquery(OtherModel.filter(field="test_value").values_list("id")))
query.sql(params_inline=True)
# SELECT ... WHERE "id" IN (SELECT "id" FROM "other_model" WHERE "field"=?)
#                                                                        ^ value missing

After

query.sql(params_inline=True)
# SELECT ... WHERE "id" IN (SELECT "id" FROM "other_model" WHERE "field"='test_value')
#                                                                        ^ value inlined

Changes

• tortoise/expressions.py: Check ctx.parameterizer before choosing between get_sql() and get_parameterized_sql()
• tests/test_query_api.py: Added regression test verifying subquery values are inlined

Test plan

• New regression test passes (test_subquery_params_inline)
• Existing subquery tests pass (test_queryset.py -k subquery)
• Existing params_inline tests pass (test_case_when.py)
• All query API tests pass (16 passed, 2 skipped)