home: Drop animated arrow
I had a look at @snwh's suggestion to use only the powerbar and drop the animated arrow from the home bar.
As noted in !1206 (merged) I'm not certain this is better but then I'm also not that much attached to the animated
arrow to insist
* home: Remove superfluous placeholder
* home: Remove unbound template callback
on_powerbar_action_failed is not used in the ui file
* home: Drop some trailing whitespace
* home: Drop animated arrow
Drop the animated arror and only use the fixed drag handle. This allows
us to drop the stack that contained powerbar and arrow too.
* home: Fix ui file indent
We do this in a separate commit to ease review
/cc @mathew-dennis as this uses his recent work as a base