selftests/hid: tablets: reduce the number of pen state

All the *_WITH*BUTTON states were almost identical except for the
button itself.

I need to add a new device with a third button, and adding a bunch of
states is going to be quite cumbersome.

So convert the `button` parameter of PenState as a boolean, and store
which button is the target as an argument to all functions that need it.

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Peter Hutterer <[email protected]>
Signed-off-by: Benjamin Tissoires <[email protected]>

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