Reformat code to PSR1 / PSR2

Fixed bug in pushNotification() where default app_id wasn't being acknowledged correctly.

Author: jmrieger

src/OneSignalClient.php

@@ -212,14 +212,15 @@ public function postNotification($data = [], $app_id = '')
             "priority"                   => false,
 
         ];
+
         $clean_data = [];
 
         // Loop on all of the available parameters (we're sanitizing our data)
         foreach ($valid_params AS $param => $required) {
             // If we have a required parameter that's not present in the param data, this request is not valid
             if ($required && !array_key_exists($param, $data)) {
                 // Ignore the app_id if it was passed
-                if ($param == 'app_id') {
+                if ($param == 'app_id' && $app_id) {
                     $data[ $param ] = $app_id;
                 } else {
                     if ($param == 'app_id' && $this->appId) {