Remove systemd hardening options for system services
Remove systemd hardening options for system services

fluidsynth.service.in:
As fluidsynth is run as a systemd user service, applying sandboxing
options only available to systemd system services will prevent the user
service from starting, thus we remove the ones only available to system
services.

FluidSynth/fluidsynth,FluidSynth/fluidsynth,FluidSynth/fluidsynth,FluidSynth/fluidsynth