pathbar: Making the path bar shrinkable

Long folder name prevent nautilus from resize or tile

The path bar currently do not shrink in size with the windows size

This fix will shrink the path bar size according to the windows size

Closes GNOME/nautilus#425
3 jobs for clean-up-pathbar in 8 minutes and 59 seconds (queued for 3 seconds)
latest
Status Name Job ID Coverage
  Test
passed flatpak #41506

00:06:58

 
  Deploy
passed review #41507

00:02:00

manual stop_review #41508
allowed to fail manual