dc_get_push_state() returns wrong value since recent update

[r10s]

on iOS, dc_get_push_state() returns DC_PUSH_HEARTBEAT (1) even though chatmail is used and push notifications are working (just tested)

expected return value in this case is DC_PUSH_CONNECTED (2)

i do not know exactly when this but was introduced, i've noticed the connectivity warning some days ago, but investigated just now.

to be clear: the functionality seems okay, but the status is reported wrong. still, the correct status is important for debugging; that area is pretty sensible :)

this is how the connectivity looks like - the "yellow warning dot" should be a "green ok dot" on chatmail:

maybe related to recent changes in that area, #6239

[r10s]

ftr, it works on non-sandbox atm (just switched to ios1.50.1 from apple store)

EDIT: reading the fix, on next push-token-set, we would subscribe to both again, resulting in DC_PUSH_HEARTBEAT being reported again