Fix perfetto tracing of manual transitions

Currently, manual transitions are marked as started but never end in
perfetto, because a different slice name is generated for the start and
end of the animations.

Fixes: 353523877
Flag: EXEMPT bugfix
Test: collected perfetto traces on manual glanceable hub transitions and
verified they are shown correctly

Change-Id: Idb2187af9e31fde7ac4983c1e45d55f0375276e7