use clear_craft to remove default sandstone recipe

get rid of the two grinder recipes from homedecor/fake_fire (obsolete)

technic/machines/register/compressor_recipes.lua

@@ -20,11 +20,11 @@ local recipes = {
 }
 
 -- defuse the default sandstone recipe, since we have the compressor to take over in a more realistic manner
-minetest.register_craft({
-	output = "default:sand 0",
+minetest.clear_craft({
+	output = "default:sandstone",
 	recipe = {
 		{'group:sand', 'group:sand'},
-                {'group:sand', 'group:sand'}
+		{'group:sand', 'group:sand'}
 	},
 })
 

technic/machines/register/grinder_recipes.lua

@@ -62,12 +62,6 @@ for _, data in pairs(recipes) do
 	technic.register_grinder_recipe({input = {data[1]}, output = data[2]})
 end
 
--- defuse common grinder unfriendly recipes
-if minetest.get_modpath("fake_fire") then -- from homedecor_modpack
-	minetest.register_craft({ output='default:cobble 0', recipe={{'default:cobble'}}})
-	minetest.register_craft({ output='default:gravel 0', recipe={{'default:gravel'}}})
-end
-
 -- dusts
 local function register_dust(name, ingot)
 	local lname = string.lower(name)