Remove residual FIXME from window merge work
During window merge, DQA was temporarily disabled with GPORCA. After the following PR, this was resolved. In this PR, I am cleaning a residual outdated fixme https://github.com/greenplum-db/gpdb/pull/4086 The string_agg function was categorized as ordered window aggregate in GPDB 5. So GPORCA did not support that and fallbacks to planner. In GPDB 6 string_agg is a straightforward window aggregate, so GPORCA supports it.
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