[Bug 1798293] [NEW] Don't restrict jump list actions to Unity

[8p-k26-gj]

Public bug reported:

Jump list actions like Compose new message and Contacts shouldn't be restricted to show in Unity or Messaging Menu because they work on Plasma as well.
This used to work in Thunderbird 57 (or whatever was in xenial) but stopped working after a recent update to Thunderbird 60 in bionic.
A similar fix was done to Firefox Bug 1615549 a while ago

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1798293

Title:
  Don't restrict jump list actions to Unity

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