Extend vibration time for OPO

[Flohack74]

With that PR ubports/usensord#2 in place we can extend the vibration time in this upstart job so that OPO finally vibrates really on keyboard input :)

[mariogrip]

I wonder, why dont we enable this on all devices? or are there a difference in the feeling on each devices?

Edit, i saw the comment on ubports/usensord#2, i understand now :)

[mariogrip]

Please make this an upstart override instead.

usensord.override with just:

env VIBRATE_SCALE=15

should work

[Flohack74]

Uh totally was too late, yes sure. I was not thinking that overlay in fact is "merged" into the conf, was thinking more of a replace way would happen ;)

[giiba]

My OPO went from barely there to audibly aggressive. I feel VIBRATE_SCALE=15 is too much, and in some quick testing found a scale of 6 to be quite nice as far as the keyboard haptic effect.

[Flohack74]

Well we can adjust this a bit, but there will be no real good solution for all users unless its configurable. You might want to add a feature request for that.
I have all core devices here, and you should compare the feel to N5, E5 or FP2, I personally think they are vibrating even more, and could need a tune down. But, I will try to get more feedback on that, and we keep this for final decisions before OTA ships ;)