Update wingpanel setting schema

[danirabbit]

• [x] To be merged after https://github.com/elementary/wingpanel-indicator-datetime/pull/71

[danirabbit]

I can't reproduce this issue. Have you installed the sibling date time indicator branch?

[donadigo]

Yeah the new schema is there for me. I can see it in dconf. I dunno why there's a difference like that, might just do a fresh install at this point.