Changed array creation

Make the array creation consistent throughout the class

Author: litsher

app/code/Magento/Sales/Model/Order/Pdf/Items/Invoice/DefaultInvoice.php

@@ -80,11 +80,9 @@ public function draw()
         $lines = [];
 
         // draw Product name
-        $lines[0] = [
-            [
+        $lines[0][] = [
                 'text' => $this->string->split($this->prepareText((string)$item->getName()), 35, true, true),
                 'feed' => 35
-            ]
         ];
 
         // draw SKU