[pumpio/twitter] Replace global $a with BaseObject::getApp()

pumpio/pumpio_sync.php

@@ -2,7 +2,7 @@
 use Friendica\Core\Config;
 
 function pumpio_sync_run(&$argv, &$argc) {
-	global $a;
+	$a = Friendica\BaseObject::getApp();
 
 	require_once("addon/pumpio/pumpio.php");
 

twitter/twitter_sync.php

@@ -4,7 +4,7 @@ use Friendica\Core\Config;
 
 function twitter_sync_run($argv, $argc)
 {
-	global $a;
+	$a = Friendica\BaseObject::getApp();
 
 	require_once 'addon/twitter/twitter.php';