CheckboxMultiselectInputWidget: Fix handling of 'name' config option in JS
CheckboxMultiselectInputWidget: Fix handling of 'name' config option in JS

Due to incorrect order of operations the option was entirely ignored.
Follow-up to 5a173feeee01c2fe67d86f0f4b0f8421656ae3d5.

Bug: T187665
Change-Id: Ia33f181ca8d27ecc7991cb9e473c3bf2d20896f2

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui