Disables app group feature if app has no app groups

We can’t remove all app groups from an App ID once one has been assigned, but we _can_ disable app groups completely for effectively the same result.

This fixes some apps having permanant access to AltStore’s own app group after being (de-)activated.

AltStore/Operations/FetchProvisioningProfilesOperation.swift

@@ -320,8 +320,14 @@ extension FetchProvisioningProfilesOperation
         
         if let applicationGroups = entitlements[.appGroups] as? [String], !applicationGroups.isEmpty
         {
+            // App uses app groups, so assign `true` to enable the feature.
             features[.appGroups] = true
         }
+        else
+        {
+            // App has no app groups, so assign `false` to disable the feature.
+            features[.appGroups] = false
+        }
         
         var updateFeatures = false
         
@@ -333,6 +339,11 @@ extension FetchProvisioningProfilesOperation
                 // AppID already has this feature enabled and the values are the same.
                 continue
             }
+            else if appID.features[feature] == nil, let shouldEnableFeature = value as? Bool, !shouldEnableFeature
+            {
+                // AppID doesn't already have this feature enabled, but we want it disabled anyway.
+                continue
+            }
             else
             {
                 // AppID either doesn't have this feature enabled or the value has changed,