[8.x] Fixes getting the trusted proxies IPs from the configuration file (#41322)

* Update TrustProxies.php

* Use getter

Author: nunomaduro

src/Illuminate/Http/Middleware/TrustProxies.php

@@ -47,7 +47,7 @@ public function handle(Request $request, Closure $next)
      */
     protected function setTrustedProxyIpAddresses(Request $request)
     {
-        $trustedIps = $this->proxies();
+        $trustedIps = $this->proxies() ?: config('trustedproxy.proxies');
 
         if ($trustedIps === '*' || $trustedIps === '**') {
             return $this->setTrustedProxyIpAddressesToTheCallingIp($request);