Remove unneeded ID number, we just need the manufacturer name for mysql inserts

[curtishall]

Remove unneeded ID number, we just need the manufacturer name

Fixes #647

We were pulling the following json via API...however were added the Manufactuer AND the ID (for unknown reasons) which was being inserted into the database like 'IP Camera - recpSlTQIiaJez87D' which should never have happened and the model insert into mysql was too long anyway causing an ajax error.

{
	"id": "recpSlTQIiaJez87D",
	"createdTime": "2017-08-12T02:06:43.000Z",
	"fields": {
		"ManufacturerLink": [
			"recpeE5rOIW7SRmsC"
		],
		"id": 967,
		"JPEG path": "cgi-bin/guest/Video.cgi?media=JPEG",
		"Model": "Default",
		"Manufacturer": [
			"IP Camera"
		],
		"RTSP path fixed": "/"
	}
}

[andrey-utkin]

This loop iterates over all known camera models for the searched manufacturer.
We can't use rawurlencode($manufacturer) as the array index because all the entries but the last one will be overwritten.

[andrey-utkin]

I have doubt that the fix proposed is going to work. I'd need some more time to understand how the key strings of $list generated there end up in $data[model] being inserted.

Devices.model DB field is limited to 30 characters (see misc/sql/schema_mysql.sql), I think we should give it more:

CREATE TABLE `Devices` (
...
  `model` varchar(30) DEFAULT NULL,