c-select broken

The formData getter of c-select is broken, see confirm/hactar/core#112.

When a form containing a c-select component, the values are not committed. Apparently, the formData getter got broken in this commit.

I did a git bisect:

20c324dbf7ba08df85648aa4e73a785292b99918 is the first bad commit
commit 20c324dbf7ba08df85648aa4e73a785292b99918
Author: Dominique Barton <dbarton@confirm.ch>
Date:   Wed Nov 10 19:57:09 2021 +0100

    FEATURE: Show selected items in c-select

    See also #73

 confirm/translucent/components/c-checkbox/script.js   | 19 ++++++++++++++++---
 .../translucent/components/c-checkbox/template.html   |  1 +
 confirm/translucent/components/c-radio/script.js      | 14 ++++++++++++++
 confirm/translucent/components/c-radio/template.html  |  1 +
 confirm/translucent/components/c-select/script.js     | 13 +++++++++++++
 confirm/translucent/components/c-select/template.html |  2 +-
 6 files changed, 46 insertions(+), 4 deletions(-)

/cc @raiffeisen