Coverity analysis defect 128731: Parse warning

Parse warning

A parse warning may reduce maintainability of the code, or it may indicate a serious error. A parse warning from the Coverity parser may indicate a bug, or poor coding practice
/src/mongo/db/query/sbe_stage_builder_projection.cpp:86: PW.USELESS_TYPE_QUALIFIER_ON_RETURN_TYPE 128731 type qualifier on return type is meaningless