test-cal-client-get-revision could fail due to delayed D-Bus property change notification
The test had been mostly working, except cases when the delivery of a D-Bus property change signal had been delayed. Then the value on the client side was not the same as the value on the server side. There's a very similar test for EBookClient, which does slightly more things, which gives D-Bus enough time to deliver the property change to the client, thus this change adds the component removal to address it.
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