Add deviceId as an message input parameter

[ckhmer1]

Hi, first of all, thanks for your great job. I'd like to specify the deviceId inside the message sent to the node and not always inside the node itself, like msg.deviceId= ..... It should is a simple fix, in ewelink-connect.js, just replaced the row:

    evaluatedParams.unshift(deviceId);
    // First parameter should be always the device ID

with following rows:

    let device_id = '';
    if (deviceId) {
      device_id = deviceId;
    } else if (typeof msg.deviceId !== "undefined") {
      device_id = msg.deviceId || '';
    }
    // First parameter should be always the device ID
    evaluatedParams.unshift(device_id);

In this way it the deviceId is not specified inside the node configuration, it will use the one specified inside the message.

Thanks Claudio

[coveralls]

Pull Request Test Coverage Report for Build 93

• 4 of 6 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-4.5%) to 93.023%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/utils/ewelink-connect.js	4	6	66.67%
<!--	Total:	4	6	66.67%	-->

Totals
Change from base Build 84:	-4.5%
Covered Lines:	101
Relevant Lines:	105

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💛 - Coveralls

[ckhmer1]

Don't use additional variables, use the same deviceId (you can modify declaration to let instead of const or and you can do all of this inline at line 48).

Done. Is it ok now?