Fix Debian scripts with correct binary name

debian/ula-nginx-authenticator.install

-usr/bin/nginx-authenticator /usr/bin/ula-nginx-authenticator
+usr/bin/nginx-authenticator

debian/ula-nginx-authenticator.service

@@ -5,7 +5,7 @@ Requires=ula-nginx-authenticator.socket
 [Service]
 Type=notify
 User=ula-nginx-authenticator
-ExecStart=/usr/bin/ula-nginx-authenticator --systemd-activation
+ExecStart=/usr/bin/nginx-authenticator --systemd-activation
 Restart=always
 RestartSec=3
 

debian/ula-nginx-authenticator.socket

@@ -5,7 +5,7 @@ Description=ULA NGINX authenticator socket
 ListenStream=/run/nginx-authenticator/socket
 SocketMode=660
 DirectoryMode=755
-SocketUser=root
+SocketUser=ula-nginx-authenticator
 SocketGroup=nginx
 Accept=false