Remove redundant checks for power of 0

[S5NC]

The power cannot be 0 once the execution results in whichever radio module interface initialised RadioInterface through RadioLibInterface, as the code below is executed (comment clarified)

    if ((power == 0) || ((power > myRegion->powerLimit) && !devicestate.owner.is_licensed))
        power = myRegion->powerLimit;
    
    if (power == 0)
        power = 17; // Default to this power level if we don't have a valid regional power limit (powerLimit of myRegion defaults
                    // to 0, currently no region has an actual power limit of 0 [dBm] so we can assume regions which have this
                    // variable set to 0 don't have a valid power limit)

Therefore, it is unecessary to then check again if power is 0 in each radio module's interface. This behaviour was found as the changes in #2813 which removed this check had no effect (the intention was to avoid accidentally setting 0 dBm to max power, but this should have not been done as this was intended behaviour as the default value sent in protobufs is empty (0) to reduce the message size, as in most cases you will be transmitting at the maximum allowed power), it didn't cause SX126x devices to transmit at 0 dBm, but continues behaving as before.

[github-actions]

🤖 Pull request artifacts

file	commit
pr2934-firmware-2.2.14.137c5b4.zip	c301a4d