Make sleep work again when BLE is disabled

In commit 4944aa48 ("fix(ble): Update to changes from new SDK") a call to BbDrvDisable() was added to sleep_deepsleep(). This function must, however, only be called when BLE was previously initialized, otherwise a wakeup from deepsleep will not be possible (if it ever reaches it?).

Fix this by reworking the BLE enabled check to also be usable here, to only call BbDrvDisable() when BLE is active.

Fixes: 4944aa48 ("fix(ble): Update to changes from new SDK")
Fixes: #231 (closed)

changed milestone to %v1.17

added 1-Bug 3-Epicardium 4-BLE labels

added 6 - Needs Review label

Looks good to me! Thanks for keeping our codebase clean.

However, I'm only a bot - so a human will still have to approve this request.

mentioned in commit b6368279

merged