Make ++ecdsa-raw-recover accept unmodified signature
Continuation of
++ ecdsa-raw-recover :: get pubkey from sig
|= [has=@uvI sig=[v=@ r=@ s=@]]
^- pont
- ?> ?&((lte 27 v.sig) (lte v.sig 34))
+ ?> (lte v.sig 7)
=/ x r.sig
=/ ysq (sum.p b (exp.p 3 x)) :: omits A=0
=/ bet (exp.p (div +(^p) 4) ysq)
