Use existing height timer to retry untractable packages

Use existing height timer to retry untractable packages

Untractable packages are those which cannot have their fees updated once
signed, hence why they weren't retried. There's no harm in retrying
these packages by simply re-broadcasting them though, as the fee market
could have spontaneously spiked when we first broadcast it, leading to
our transaction not propagating throughout node mempools unless
broadcast manually.