view-switcher-bar: Ellipsize in narrow mode

This lets HdyViewSwitcherBar reach even narrower widths.
7 jobs for view-switcher-ellipsize in 8 minutes and 21 seconds (queued for 4 minutes and 4 seconds)
Status Job ID Name Coverage
  Build
passed #34980
librem5
build-debian-clang

00:02:22

passed #34978
librem5
build-debian-gcc

00:02:03

passed #34979
librem5
build-debian-gcc-static

00:01:49

passed #34982
librem5
build-debian-package

00:01:59

passed #34981
librem5
build-fedora-gcc

00:03:05

 
  Docs
passed #34983
librem5
build-gtkdoc

00:01:37

 
  Test
passed #34984
librem5
unit-test

00:01:34

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