gall: simplify +ap-doff filter conditional
|- ^+ ap-core
?~ subs ap-core
=+ [wyr dok]=i.subs
- ?. |(?=(~ ship) =(u.ship ship.dok))
+ ?: =(ship `ship.dok)
$(subs t.subs)
=/ let (~(got by boar.yoke) wyr dok)
|- ^+ ap-core
