Fix inconsistency in StringSource MarshalJSON
Fix inconsistency in StringSource MarshalJSON

The method should be bound to *StringSource like every other type in
the codebase.  The unintentional copy did not result in any
behavioral changes.

Signed-off-by: Monis Khan <19f7b2d00144930eab99c4cfd2a8d2d2a225ef67@redhat.com>

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