Switch to async handlers for the status view
Switch to async handlers for the status view

Reverts a4947a75feb0c6a3ead2161c8eb1a68d5e37a933

Generally using the "async" handlers is preferred. 2405f81 together
with the following a4947a7 (which we revert hereby) suggest that we
needed the "sync" variants to make the transient check work.

At this point we can only guess, but maybe calling
`window.transient_view_in_group()` was the culprit here.

However, since then we changed the code and actually do not check the
transient state anymore. Hence we can go back using the "async"
handlers.

divmain/GitSavvy,divmain/GitSavvy,divmain/GitSavvy