Fix parent source as being set as Xray, when trace merging disabled #60
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What does this PR do?
Currently, the layer will set a metadata field on the root dd-trace span called '_dd.parent_source' to 'xray' even when x-ray merging is disabled. That field is used by the trace forwarder to filter out spans, to reduce duplication between x-ray and dd-trace traces. This PR fixes that issue, so that when x-ray trace merging is disabled, the field remains unset, and the root span is never filtered out.
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