refactor(battery_simulator): clean up param SIM_BAT_ENABLE (#26823)

* refactor(battery_simulator): remove SIM_BAT_ENABLE

disable instead with SIM_BAT_DRAIN <= 0

* fix(battery_simulator): disable battery sim only if SIM_BAT_DRAIN strictly < 0

* fix(battery_simulator): disable if 0, adjust limit to 0

* fix(battery_simulator): remove constraining again

now that SIM_BAT_DRAIN=0 means the module is not started we are safe
from division by zero again (param compare has a tolerance of 1e-7)

* fix(battery_simulator): constrain param to min of 1

to avoid division by zero.

This reverts commit 6380c4fdee.

* fix(battery_simulator): remove arbitrary param max

* fix(battery_simulator): reword long param description

Co-authored-by: Jacob Dahl <37091262+dakejahl@users.noreply.github.com>

* fix(battery_simulator): reword short param description

Co-authored-by: Jacob Dahl <37091262+dakejahl@users.noreply.github.com>

---------

Co-authored-by: Jacob Dahl <37091262+dakejahl@users.noreply.github.com>

ROMFS/px4fmu_common/init.d-posix/rcS

@@ -249,7 +249,7 @@ fi
 
 load_mon start
 
-if param compare SIM_BAT_ENABLE 1
+if param greater SIM_BAT_DRAIN 0
 then
 	battery_simulator start
 fi