Fix misindented del statement
#3954
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Fixes python#3892. Everywhere we infer the correct type for a partially-typed variable, we do two things: set var.type and delete var from partial_tyes. However in one place (try_infer_partial_type_from_indexed_assignment()) the var.type assignment was skipped if the current node was deferred but the deletion was done unconditionally. This caused the partial type to remain in a place where serialization could not handle it.
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Fixes #3892.
Everywhere we infer the correct type for a partially-typed variable,
we do two things: set var.type and delete var from partial_tyes.
However in one place (try_infer_partial_type_from_indexed_assignment())
the var.type assignment was skipped if the current node was deferred
but the deletion was done unconditionally. This caused the partial
type to remain in a place where serialization could not handle it.