fix(nfs): remove dangerous -s flag and unsupported sync option from unfs3

nfs/config.json

@@ -1,6 +1,6 @@
 {
   "name": "NFS Server",
-  "version": "1.0.13",
+  "version": "1.0.14",
   "slug": "nfs_server",
   "description": "Expose Home Assistant media folder via NFS.",
   "arch": [
@@ -27,8 +27,7 @@
         "folder": "media",
         "allowed_network": "192.168.1.0/24",
         "read_only": false,
-        "root_squash": true,
-        "sync": true
+        "root_squash": true
       }
     ]
   },
@@ -38,8 +37,7 @@
         "folder": "str",
         "allowed_network": "str",
         "read_only": "bool",
-        "root_squash": "bool",
-        "sync": "bool"
+        "root_squash": "bool"
       }
     ]
   },