Do not shutdown device upon errors

[thecode]

This PR removes the calls to shutdown (Gen1) and self._disconnect_websocket() (same as shutdown, Gen2+) upon failures.
The shutdown process removes subscription to device async updates (updates which are pushed from the device by IP/MAC), this method is not reversible so after calling shutdown the only way to resubscribe to updates is to create a new device object.
However for sleeping devices we need the updates to continue flowing even if there is a failure since they trigger event to connect to the device.

Currently, If a sleeping device has an error on first time that we try to connect to it and it fails subsequent events from the device will be stopped so there won't be anything to try to trigger a new connection to the device on the next wakeup.
This logic was existing up to aioshelly 8.2.0 and removed by mistake (only the raise was supposed to move out of the condition)

aioshelly/aioshelly/block_device/device.py

Lines 168 to 170 in e8058a5

	if not async_init:
	self.shutdown()
	raise self._last_error from err

However it would be better not to call shutdown at all and let the caller/user decide when to shutdown the device.

[bieniu]

Looks good, tested with a real device.