Multiple fixes to get editSettingValue() working

https://github.com/opencart/opencart/commit/e90b2a9e02e3fe9ab42ef43030cf8aff717e164f

https://github.com/opencart/opencart/commit/43ee65bd5d9fc256e8f1d75c611b8cea5ffbc526

https://github.com/opencart/opencart/commit/4af3eb1f9afe52394b11cc73951cbedec08b4a64