Fix "apline" typo in alpine-xfce4-novnc.json (#192)

Presumably the directory named "apline" was supposed to be named alpine? 

The note saying "Default username/password will be alpine/alpine" implies the user (and therefore home directory) was indeed supposed to be named alpine.

template/apps/alpine-xfce4-novnc.json

@@ -21,8 +21,8 @@
 	"type": 1,
         "volumes": [
                 {
-                        "bind": "/portainer/Files/AppData/Config/alpine-xfce4-novnc/home/apline/downloads",
-                        "container": "/home/apline/downloads"
+                        "bind": "/portainer/Files/AppData/Config/alpine-xfce4-novnc/home/alpine/downloads",
+                        "container": "/home/alpine/downloads"
                 }
         ],
 	"webpage": "https://github.com/novaspirit/Alpine_xfce4_noVNC"