fix search-and-replace damage from a while back

a batch change from ship to self broke the thing that kept the player on
the screen. also spawn_goodie got missed in the migration to `_ENV` for
looking up stuff by name.

vacuum_gambit.p8

@@ -443,7 +443,7 @@ function ship_m:move()
  self.x += self.xmomentum
  self.y += self.ymomentum
  
- if self == primary_self then
+ if self == primary_ship then
   self.x = mid(0, 112 - 8 * self.size, self.x)
   self.y = mid(0, 128 - 8 * self.size, self.y)
  end
@@ -1285,7 +1285,7 @@ end
 function spawn_goodie(goodie_name, x, y, sz)
  if (not goodie_name or #goodie_name == 0) return
  local sh = sz and sz/2 or 0
- goodies[goodie_name].new{}:spawn_at(x+sh,y+sh)
+ _ENV[goodie_name].new{}:spawn_at(x+sh,y+sh)
 end
 
 function multi(times, interval, fnm, ...)