Removes unused obj flags and fixes overlapping flags

Removes ONESIZEFITSALL and NOSHIELD, which were unused.

code/defines/obj/weapon.dm

@@ -241,7 +241,6 @@
 	throw_speed = 1
 	throw_range = 5
 	w_class = 2.0
-	flags = NOSHIELD
 	attack_verb = list("bludgeoned", "whacked", "disciplined")
 
 /obj/item/weapon/staff/broom
@@ -268,7 +267,6 @@
 	throw_speed = 1
 	throw_range = 5
 	w_class = 2.0
-	flags = NOSHIELD
 
 /obj/item/weapon/wire
 	desc = "This is just a simple piece of regular insulated wire."