fix regression bug in 'incorrect top-5 customers' sorting in traffic-…

…overview which leads to incorrect customer-links due to wrong indexing in the array; fixes #1236

Signed-off-by: Michael Kaufmann <[email protected]>

lib/Froxlor/Traffic/Traffic.php

@@ -103,7 +103,7 @@ public static function getCustomerStats(array $userinfo, string $range = null, b
 		}
 
 		// sort users by total traffic
-		usort($users, function ($user_a, $user_b) {
+		uasort($users, function ($user_a, $user_b) {
 			if ($user_a['total'] == $user_b['total']) {
 				return 0;
 			}