CmdPal: Enable entrance animation for End dock bands (#48099)

## Summary

Fixes #46767

Items pinned to the End section of the dock did not animate on startup,
while Start and Center items did. The EndListView had an explicit empty
`ItemContainerTransitions` collection that suppressed all container
transitions. Removing it allows the default WinUI entrance animations to
play, matching Start and Center behavior.

## Changes

- `DockControl.xaml`: Remove empty `TransitionCollection` override from
EndListView

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Co-authored-by: root <root@io.bbq>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>