Make Slime walls disappear on killing TRJ

Especially with non-Jiyva jellies no longer eating items, there's not really
any good reason to require a method of digging to access the Slime loot.

crawl-ref/source/dat/des/branches/slime.des

@@ -8,25 +8,18 @@ function fixup_slime_vaults(data, triggerable, triggerer, marker, ev)
     return
   end
 
-  local to_feat
-  if you.god() == "Jiyva" and you.one_time_ability_used() then
-    to_feat = "floor"
-  else
-    to_feat = "clear_rock_wall"
-  end
-
-  local seen = dgn.seen_replace_feat("stone_wall", to_feat)
-        seen = dgn.seen_replace_feat("clear_stone_wall", to_feat) or seen
+  local seen = dgn.seen_replace_feat("stone_wall", "floor")
+        seen = dgn.seen_replace_feat("clear_stone_wall", "floor") or seen
 
   if you.god() == "Jiyva" and you.piety_rank() >= 6 then
     if you.silenced() then
-        crawl.mpr("An unexplained breeze blows through the dungeon.", "god")
+        crawl.mpr("You feel a strange vibration for a moment.", "god")
     else
         crawl.mpr("You hear the sound of toppling stones.", "god")
     end
   else
     if seen then
-        crawl.mpr("Suddenly, the colour oozes out of the stone walls.",
+        crawl.mpr("The stone walls suddenly crumble and collapse.",
                   "monster_enchant")
     else
         crawl.mpr("You feel a strange vibration for a moment.",