bullet_base:die doesn't actually make sense

vacuum_gambit.p8

@@ -809,22 +809,14 @@ remainder:
 end
 
 function bullet_base:hitship(_)
- self:die()
  return true
 end
 
-function bullet_base:die()
-end
-
 function bullet_base:move()
  self.x += self.dx
  self.y += self.dy
  if (self.f) self.f -= 1
- if (self.y > 145) or (self.y < -64) or (self.f and self.f < 0) or (self.x > 256) or (self.x < -128) then
-  self:die()
-  return true
- end
- return false
+ return (self.y > 145) or (self.y < -64) or (self.f and self.f < 0) or (self.x > 256) or (self.x < -128)
 end
 
 function bullet_base:draw()