GMP doc: GET_LICENSE: add missing SENSOR reference

[mattmundell]

What

In the GMP doc for GET_LICENSE, add missing reference SENSOR to the PATTERN of APPLIANCE.

Also clean some elses that were making the code harder to follow.

Why

SENSOR was missing from the doc.

References

The element for SENSOR was added to the doc in 5b274d1, just the reference in PATTERN was missing.

Confirm

Using libtheia-dummy:

$ o m m '<get_license/>'
<get_license_response status="200" status_text="OK">
  <license>
    <status>200</status>
    <content>
      ...
      <appliance>
        <model>Model9</model>
        <model_type>Type11</model_type>
        <sensor>1</sensor>                <!-- HERE -->
      </appliance>

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