virtualbox-with-extension-pack-np: Fix autoupdate for ext-pack version

Add VirtualBox extension pack to autoupdate URLs, to prevent mismatch
between base installer and extension pack versions. Scoop supports
autoupdate URL collections with: [ScoopInstaller/Scoop#3518](ScoopInstaller/Scoop#3518).

Closes TheRandomLabs#238.

Author: beargle

bucket/virtualbox-with-extension-pack-np.json

@@ -68,7 +68,10 @@
     "autoupdate": {
         "architecture": {
             "64bit": {
-                "url": "https://download.virtualbox.org/virtualbox/$version/VirtualBox-$version-$matchRevision-Win.exe#/VBoxSetup.exe"
+                "url": [
+                    "https://download.virtualbox.org/virtualbox/$version/VirtualBox-$version-$matchRevision-Win.exe#/VBoxSetup.exe",
+                    "https://download.virtualbox.org/virtualbox/$version/Oracle_VM_VirtualBox_Extension_Pack-$version-$matchRevision.vbox-extpack"
+                ]
             }
         },
         "hash": {