Renaming caddy service for simplicity

Signed-off-by: Ondrej Kubik <ondrej.kubik@canonical.com>

snapcraft.yaml

@@ -38,7 +38,7 @@ apps:
         daemon: simple
         plugs: [network, network-bind]
 
-    caddy-service:
+    caddy:
         command: caddy-control
         daemon: simple
         plugs: [network, network-bind]