[SOGo] Fix file path of sogo-full.svg

[Compose] Updated SOGo image
[Update] Add user.name and user.email for local git config if missing

docker-compose.yml

@@ -138,7 +138,7 @@ services:
             - phpfpm
 
     sogo-mailcow:
-      image: mailcow/sogo:1.47
+      image: mailcow/sogo:1.48
       build: ./data/Dockerfiles/sogo
       environment:
         - DBNAME=${DBNAME}