Configuration::updateValue: preserve new lines

There was a bug introduced in 1.1.0 that resulted in new lines being
striped away from configuration values, if $html escaping was not used.
This bug was caused by this code:

  strip_tags(Tools::nl2br($value));

Which is obviously wrong. nl2br converts new lines to <br />, and
strip_tags immediately removes this tag from the code.

The fix is to remove nl2br call altogether.

Closes #1107

classes/Configuration.php

@@ -635,7 +635,7 @@ public static function updateValue($key, $values, $html = false, $idShopGroup =
                     $value = Tools::purifyHTML($value);
                 } else {
                     // if html values are not allowed, strip tags
-                    $value = strip_tags(Tools::nl2br($value));
+                    $value = strip_tags($value);
                 }
             }
         }