add initialization options to zonk_mode background

vacation.p8

@@ -723,8 +723,16 @@ zonk_mode = {
  cy=0,
 }
 mknew(zonk_mode, function(self)
- self.stripes=fuzzy_stripey.new{}
+ self.stripes=fuzzy_stripey.new{
- self.brth=breather.new{}
+  colors=self.bg_stripe_cols,
+  dy=self.bg_dy,
+  weight=self.bg_wgt,
+ }
+ self.brth=breather.new{
+  colors=self.br_cols,
+  sep=self.br_sep,
+  speed=self.br_spd,
+ }
 end)
 
 function zonk_mode:set(_, field,value)