[CompositeClipPathAnimation] Fallback to main for geometry box

Currently paint worklet based clip path animations are not capable of
interpolating between paths of different reference geometries. This
change falls back to main in this case.

Bug: 379052285

Change-Id: I57c5e032a63a34616e0e15e67f0a30263bfee9c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6019113
Commit-Queue: Claire Chambers <clchambers@microsoft.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1386293}