flowblade: update to 2.8.

[shizonic]

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR

[ahesford]

In line 7, please change

make_install_args="--install-lib=${DESTDIR}/usr/share/pyshared"

to

make_install_args="--install-lib=${DESTDIR}/usr/share/flowblade"

Not only is this the preferred path in /usr/bin/flowblade (that path is checked first; if it does not exist, the pyshared directory is used as a fallback), but using flowblade instead of pyshared is better aligned with how other Void packages use /usr/share.

[shizonic]

Thanks! Done.