Remove /var/lib/bluetooth workaround

bluez 5.64 attempted to "lockdown" the daemon/service file access. In the process of doing so it broke badly. With 5.64 the manual path handling was changed to {State,Configuration}Directory{,Mode} tokens in the systemd service.

Drop the no longer applicable workaround.

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As an aside, I've recently been hammering away at the gem that bluez is. In particular:

• the dbus-org.bluez.obex.service symlink should be handled upstream
• all the conf files should be installed by default
• we no longer need separate package for the sixaxis plugin it becomes built-in
• snippet based config handling ... might even throw in stateless systems support soon (tm)

Upstream has been slowly migrating the "doc/*txt" into proper "doc/*rst", with the latter being converted to man pages. Who knows with the next bluez release we might even drop the "install .../docs/*txt" from our PKGBUILD 🤞