Change input padding to allow more horizontal room for number fields

* The 10px horizontal padding causes number fields, like the
  quantity field, to not fully display the number in the space
  allowed.

Fixes #3938
Bump ransack to 1.1.0
Check line_items key exist before mapping (api)

Sometimes we might want update only an order attribute, e.g. email, and
not the line items. In that case users would get an error response so we
better check if the key exist