nautilus-share-bar: Ellipsize label

Long labels can force the nautilus window to become too wide.

Allow ellipsization to prevent this disruption of window sizing.

Fixes #26
1 job for wip/antoniof/ellipsize-share-bar-label in 2 minutes and 5 seconds
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Status Job ID Name Coverage
  Test
passed build_stable #1078948

00:02:05