fix(spool): EnvelopeBufferGuard::remove must return same element as peek()
#3960
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EnvelopeBufferGuardwas intended as a reference to the first element in the buffer, that can be transformed into an owned envelope by calling.remove(). In order for this to work,peek()must not change the order of elements in the buffer, as it does now. This requirement was more obvious whenEnvelopeBufferGuardwas namedPeek.See
peek_remove_gets_same_element.