Rs. currency symbol can use rupee sign html entity

@see http://www.w3schools.com/charsets/ref_utf_currency.asp

includes/wc-core-functions.php

@@ -407,14 +407,12 @@ function get_woocommerce_currency_symbol( $currency = '' ) {
 			$currency_symbol = 'kr';
 			break;
 		case 'NPR' :
-			$currency_symbol = 'Rs.';
+		case 'PKR' :
+			$currency_symbol = '&#8360';
 			break;
 		case 'PHP' :
 			$currency_symbol = '₱';
 			break;
-		case 'PKR' :
-			$currency_symbol = 'Rs.';
-			break;
 		case 'PLN' :
 			$currency_symbol = 'zł';
 			break;