Merge pull request #11340 from Ghommie/Ghommie-cit605

Porting movespeed modifiers code updates.

code/game/objects/items.dm

@@ -377,6 +377,7 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 		qdel(src)
 	item_flags &= ~IN_INVENTORY
 	SEND_SIGNAL(src, COMSIG_ITEM_DROPPED,user)
+	user.update_equipment_speed_mods()
 
 // called just as an item is picked up (loc is not yet changed)
 /obj/item/proc/pickup(mob/user)
@@ -422,6 +423,7 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 		if(item_action_slot_check(slot, user, A)) //some items only give their actions buttons when in a specific slot.
 			A.Grant(user)
 	item_flags |= IN_INVENTORY
+	user.update_equipment_speed_mods()
 
 //sometimes we only want to grant the item's action if it's equipped in a specific slot.
 /obj/item/proc/item_action_slot_check(slot, mob/user, datum/action/A)