Fix nuxeo-restore-version-button temporarily displaying latest version in label

When viewing a Document's x versions in increasing order, viewing the latest version very briefly has the nuxeo-restore-version-button display "Restore x.0" before disappearing.

Steps to Reproduce:

1. Create or navigate to a Document with x versions. Click the versions navigator to see x+1 entries, for example if x = 3 we observe:
   • 3.0 (Latest)
   • 3.0
   • 2.0
   • 1.0
2. Click on the earliest version. Progressively increase the version being viewed (in the above example, 1.0 to 2.0) and observe the label of the Restore button in nuxeo-document-info-bar changing accordingly.
3. Click the second to last entry (in the above example, 3.0).

Expected behavior: the Restore Button simply disappears as it is not possible to restore to the current version.

Actual behavior: very briefly, the Restore button label displays the latest version before disappearing (in the above example, "Restore 3.0"). See attached video for reference.