Update the mount path in app config to avoid being overriden by EFS

**Description**
As titled

**Motivation**
In the example app config we're using the same path for EFS mount so the kernel specs
under this folder will get overriden by EFS.

**Testing Done**
Successfully launched a scala app after the app image config

Author: ZhangHan

examples/scala-image/app-image-config-input.json

@@ -8,9 +8,9 @@
             }
         ],
         "FileSystemConfig": {
-            "MountPath": "/home/jovyan",
+            "MountPath": "/home/jovyan/work",
             "DefaultUid": 1000,
             "DefaultGid": 100
         }
     }
-}
+}