MotionService: Fix step notification on sleep

[MB512]

When using BLE notifications for motion it seams that the code enabels the sending of each motion even in sleep mode.

Using BLE notifications for steps should work the same.

I don't know how much this would use the battery, but i think it could not be more than with motion notification.

Fixes #2271

[github-actions[bot]]

Build size and comparison to main:

Section	Size	Difference
text	380180B	16B
data	944B	0B
bss	22544B	0B

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[mark9064]

Thanks for this contribution :) it all looked good but ended up being superseded by #2328 so I've closed it now