update aboutView

VoidLink/AboutView.swift

@@ -92,7 +92,7 @@ public struct AboutView: View {
 
                 HStack(spacing: 15) {
                     if #available(iOS 15.0, *) {
-                        if PublicUtils.isIPad {
+                        if PublicUtils.isIPad, PublicUtils.isIAPAddonAvailable {
                             Button(LocalizationHelper.localizedString(forKey: "I'm an artist")) {
                                 IAPManager.checkPurchaseInfo(.PencilProPack) { info in
                                     if !info.valid {

VoidLink/Utility/PublicUtils.swift

@@ -58,6 +58,11 @@ import UIKit
         }
     }()
     
+    @objc public static let isIAPAddonAvailable: Bool = {
+        let availableBundleIds = ["com.voidlink.iOS", "com.voidlinkextreme.iOS", "com.voidlink.tf.debug10.iOS"]
+        return availableBundleIds.contains(Bundle.main.bundleIdentifier ?? "")
+    }()
+    
     @objc public static func isLandscape() -> Bool {
         if #available(iOS 13.0, *) {
             guard let windowScene = UIApplication.shared.connectedScenes