[RCS UCE] Fix the callback onRcsConnected won't be called

When the UceController is created because of the subscriptionChanged, the RcsFeatureManager was not set to the new UceController instance.

Bug: 177495626
Test: atest UceControllerManagerTest
Change-Id: Ic22bc5295289a38d3d2c44dc968656787f482991
1 file changed