Update the rest of the blast resistance values

The values have been updated according to this list:

https://minecraft.gamepedia.com/Module:Blast_resistance_values

mods/ITEMS/mcl_monster_eggs/init.lua

@@ -26,7 +26,7 @@ local register_block = function(subname, description, tiles, is_ground_content)
 		_tt_help = S("Hides a silverfish"),
 		_doc_items_longdesc = S("An infested block is a block from which a silverfish will pop out when it is broken. It looks identical to its normal counterpart."),
 		_mcl_hardness = 0,
-		_mcl_blast_resistance = 3.75,
+		_mcl_blast_resistance = 0.5,
 	})
 end