Allow OnDemand to be toggled later

[jackivanov]

Description

This fix allows apple devices to toggle on the OnDemand mode, even if neither WiFi nor Cellular options were chosen during the initial deployment.

The only rule appears to be needed:

<key>OnDemandEnabled</key>
<integer>0</integer>
<key>OnDemandRules</key>
<array>
  <dict>
    <key>Action</key>
    <string>Connect</string>
  </dict>
</array>

Motivation and Context

Fixes #778

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• All new and existing tests passed.