chore(core): add missing parameter to set_brightness function

[bieleluk]

This PR:

1. adds the missing brightness value parameter in set_brightness function
2. If the value has been passed, the brightness is set to this value
3. parametrizes existing test to test different scenarios

[github-actions]

legacy UI changes	device test(screens) main(screens)

[github-actions]

core UI changes	device test	click test	persistence test
T2T1 Model T	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
T3B1 Safe 3	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
T3T1 Safe 5	test(screens) main(screens)	test(screens) main(screens)	test(screens) main(screens)
All	main(screens)

[matejcik]

ack on code, please fix ui tests

[obrusvit]

I actually don't think this fixes the issue, does it?

If you pass the value to the set_brightness dialog, it merely starts the UI with the value. But the first real change happens on NumberInputSliderDialogMsg::Changed which happens only if you change the number.

[bieleluk]

You are right, @obrusvit
My PR just adds a missing function parameter but does not make any functional changes.
If it is not sufficient, I can implement something like the following:

• If the parameter is a valid number, then the user will only get the confirmation screen

[bieleluk]

@obrusvit
This commit addresses your concern 0537f0c

[bieleluk]

Rebasing due to conflicts from the latest changes