Update drowning

Needed if #851 gets merged

mods/default/nodes.lua

@@ -433,6 +433,7 @@ minetest.register_node("default:water_flowing", {
 	diggable = false,
 	buildable_to = true,
 	drop = "",
+	drowning = 1,
 	liquidtype = "flowing",
 	liquid_alternative_flowing = "default:water_flowing",
 	liquid_alternative_source = "default:water_source",
@@ -464,6 +465,7 @@ minetest.register_node("default:water_source", {
 	diggable = false,
 	buildable_to = true,
 	drop = "",
+	drowning = 1,
 	liquidtype = "source",
 	liquid_alternative_flowing = "default:water_flowing",
 	liquid_alternative_source = "default:water_source",
@@ -498,6 +500,7 @@ minetest.register_node("default:lava_flowing", {
 	diggable = false,
 	buildable_to = true,
 	drop = "",
+	drowning = 1,
 	liquidtype = "flowing",
 	liquid_alternative_flowing = "default:lava_flowing",
 	liquid_alternative_source = "default:lava_source",
@@ -530,6 +533,7 @@ minetest.register_node("default:lava_source", {
 	diggable = false,
 	buildable_to = true,
 	drop = "",
+	drowning = 1,
 	liquidtype = "source",
 	liquid_alternative_flowing = "default:lava_flowing",
 	liquid_alternative_source = "default:lava_source",