When a calculator is using a preference of type :text, a textarea is shown. The calculator.js should disable/enable this textarea the same as the input from a preference of any other type.
When a calculator is using a preference of type :text, a textarea is shown. The calculator.js should disable/enable this textarea the same as the input from a preference of any other type.

Fixes #2782

lzcabrera/spree-1-3-stable,lzcabrera/spree-1-3-stable,lzcabrera/spree-1-3-stable