Revert "data: Add additional fprintd lockdown"

The current lockdown rules prevent USB devices from being accessed and
cause threading to not work.
As such, revert them until it is clear on how/if we can apply these
measures. It is primarily not clear on how to prevent fork/clone as
fprintd does not need those.

This reverts commit 2fd86624e5.

See: #82

data/fprintd.service.in

@@ -15,8 +15,6 @@ ProtectControlGroups=true
 StateDirectory=fprint
 ProtectHome=true
 PrivateTmp=true
-ProtectKernelLogs=yes
-SystemCallFilter=@system-service
 
 # Network
 PrivateNetwork=true
@@ -33,8 +31,3 @@ RestrictRealtime=true
 
 # Privilege escalation
 NoNewPrivileges=true
-TasksMax=1
-
-# Capabilities
-CapabilityBoundingSet=
-ProtectClock=yes