fix(systemd): Make default paths for runtime config and RPC socket compatible with systemd

Signed-off-by: Steffen Vogel <post@steffenvogel.de>

etc/cunicu.advanced.yaml

@@ -21,7 +21,7 @@ backends:
 rpc:
   # Path to a Unix socket for management
   # and monitoring of the cunicu daemon.
-  socket: /var/run/cunicu.sock
+  socket: /run/cunicu.sock
 
   # Start of cunīcu daemon will block until
   # its unblocked via the control socket.

etc/cunicu.schema.yaml

@@ -104,7 +104,7 @@ $defs:
             description: |
               Path to a Unix socket for management and monitoring of the cunīcu daemon.
             type: string
-            default: /var/run/cunicu.sock
+            default: /run/cunicu.sock
 
           wait:
             description: |