fix implode arg. order

Ref: https://www.php.net/manual/en/function.implode.php

Author: remicollet

src/Components/Expression.php

@@ -433,7 +433,7 @@ public static function parse(Parser $parser, TokensList $list, array $options =
     public static function build($component, array $options = array())
     {
         if (is_array($component)) {
-            return implode($component, ', ');
+            return implode(', ', $component);
         }
 
         if ($component->expr !== '' && ! is_null($component->expr)) {

src/Components/ExpressionArray.php

@@ -122,6 +122,6 @@ public static function build($component, array $options = array())
             $ret[] = $frag::build($frag);
         }
 
-        return implode($ret, ', ');
+        return implode(', ', $ret);
     }
 }