Fix server invocation in systemd unit

debian/liber.default

 
-# Uncomment this line to start the HTTP interface daemon.
-#ENABLE_SERVER=true
-
 # Set the address (host:port) to listen on.
-ADDR="--http-server=127.0.0.1:4040"
+ADDR="--addr=127.0.0.1:4040"
 
 # Directory where books are stored.
 BOOK_DIR="--book-dir=/var/lib/liber/books"

debian/liber.service

@@ -5,7 +5,7 @@ After=network.target
 [Service]
 User=liber
 EnvironmentFile=/etc/default/liber
-ExecStart=/usr/bin/liber $BOOK_DIR $ADDR $LIBER_OPTIONS
+ExecStart=/usr/bin/liber $BOOK_DIR $LIBER_OPTIONS server $ADDR
 Restart=always
 
 [Install]