ames: fix error slog on failed attestation timer
:: if we haven't received an attestation, ask again
::
?^ error
- %- (slog leaf+"ames: attestation timer failed: {<u.error>}" ~)
+ %- (slog 'ames: attestation timer failed' u.error)
event-core
?~ ship=`(unit @p)`(slaw %p i.t.wire)
%- (slog leaf+"ames: got timer for strange wire: {<wire>}" ~)
