Use 'setting_get*' methods instead of 'settings:get*':

Compatibility with 0.4.15 server.

init.lua

@@ -341,7 +341,7 @@ if minetest.get_modpath('spawneggs') and minetest.get_modpath('tnt') then
 				local pos = pointed_thing.above
 				pos.y = pos.y+1
 				minetest.add_entity(pos,'sneaker:sneaker')
-				if not minetest.settings:get_bool('creative_mode') then
+				if not minetest.setting_getbool('creative_mode') then
 					itemstack:take_item()
 				end
 				return itemstack

tnt_function.lua

@@ -3,7 +3,7 @@
 
 -- From TNT
 local cid_data = {}
-local radius = tonumber(minetest.settings:get('tnt_radius') or 3)
+local radius = tonumber(minetest.setting_get('tnt_radius') or 3)
 local large_radius = 5
 local loss_prob = {
 	['default:cobble'] = 3,