Make cobweb drop itself when dug by shears

mods/ITEMS/mcl_core/nodes_misc.lua

@@ -64,6 +64,7 @@ minetest.register_node("mcl_core:cobweb", {
 	walkable = false,
 	groups = {swordy_cobweb=1,shearsy=1, deco_block=1, dig_by_piston=1, dig_by_water=1,destroy_by_lava_flow=1,},
 	drop = "mcl_mobitems:string",
+	_mcl_shears_drop = true,
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
 	_mcl_blast_resistance = 20,
 	_mcl_hardness = 4,