examples: Use HdyViewSwitcherTitle

This makes the code simpler and better document how to implement view
switchers.
11 jobs for view-switcher-title in 14 minutes and 59 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
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librem5
api-visibility

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librem5
build-debian-clang

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librem5
build-debian-gcc

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librem5
build-fedora-gcc

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librem5
build-gtkdoc

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librem5
unit-test

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librem5
package-debian-buster

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librem5:arm64
package-debian-buster:arm64

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flatpak
package-flatpak

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librem5
autopkgtest-debian-buster-package

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librem5
lintian-debian-buster-package

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