remove prefix from event

Author: iamgabrielma

WooCommerce/Classes/Analytics/WooAnalyticsStat.swift

@@ -1268,7 +1268,7 @@ enum WooAnalyticsStat: String {
     case backgroundUpdatesDisabled = "background_updates_disabled"
 
     // MARK: Point of Sale events
-    case pointOfSaleLoaded = "pos_loaded"
+    case pointOfSaleLoaded = "loaded"
     case pointOfSaleProductsPullToRefresh = "products_pull_to_refresh"
     case pointOfSaleVariationsPullToRefresh = "variations_pull_to_refresh"
     case pointOfSaleAddItemToCart = "item_added_to_cart"