bootstate.c: do not set priority for marking slot good
bootstate.c: do not set priority for marking slot good

Marking a slot good resulted in giving it a fixed priority of 20.
This may make the slot non-booting if it owned a higher priority before.

The behavior of setting slot priority to 0 for marking a slot bad
remains untouched by this change as it does not conflict with other
priorities.

Signed-off-by: Enrico Jorns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

jluebbe/rauc,rauc/rauc,rauc/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc