Support hyphenation in the A11y FAB undo snackbar.

No flag: very minor UX fix with low potential for regression.

Bug: 323021479
Flag: NONE
Test: Change a service name to be very long and include soft hyphens,
      observe hyphenation.
Change-Id: Id13e88a5e7f0f30d6d4286b86251bbda90de2f9c