Filteringselect name attribute modification error

[gala]

In the postCreate section I try change "name" attribute of filteringselect, but that not changed. The filteringselect object's "name" attribute changed, but the hidden input dom node's "name" attribute not.

[Douglas Hays]

THe name attribute cannot be changed after creation. The API doc lists it as
name: [const] String
Some browsers don't allow this so it's const for all for consistency. Just set it in buildRendering instead.