Update plenticore.js

[psg1]

Erweiterung des devicePort

[StrathCole]

Thanks for contributing. I think there has to be a check for validity of the port here and also in #27 to avoid errors.

Valid ports should be 1 to 65535 with fallback to default 80 on invalid setting.

[psg1]

<input type="number" min="1" max=""65535" />

im plenticore.js kann man ja eine
if(devicePort<1 || devicePort>65535) {
devicePort = 80;
}