[Fedora-packaging] Fix Packaging:ScriptletSnippets#Icon_Cache

[Michael Schwendt]

https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Icon_Cache

> %post
> /bin/touch --no-create %{_datadir}/icons/hicolor &>/dev/null || :
> 
> %postun
> if [ $1 -eq 0 ] ; then
>     /bin/touch --no-create %{_datadir}/icons/hicolor &>/dev/null
>     /usr/bin/gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
> fi
> 
> %posttrans
> /usr/bin/gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :

Somebody with write-access to that page, please add the missing " || :" to
the end of the /bin/touch line in the %postun scriptlet.

Then the code would be consistent with its explanation on the page.