Convert newpipe/local/subscription/ImportConfirmationDialog to kotlin

`onSaveInstanceState` is useless after #12995

Author: Yevhen Babiichuk (DustDFG)

app/src/main/java/org/schabi/newpipe/local/subscription/ImportConfirmationDialog.java

@@ -0,0 +1,44 @@
+package org.schabi.newpipe.local.subscription
+
+import android.app.Dialog
+import android.content.DialogInterface
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AlertDialog
+import androidx.fragment.app.DialogFragment
+import androidx.fragment.app.Fragment
+import com.livefront.bridge.Bridge
+import org.schabi.newpipe.R
+
+class ImportConfirmationDialog : DialogFragment() {
+    lateinit var resultServiceIntent: Intent
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        return AlertDialog.Builder(requireContext())
+            .setMessage(R.string.import_network_expensive_warning)
+            .setCancelable(true)
+            .setNegativeButton(R.string.cancel, null)
+            .setPositiveButton(R.string.ok) { _, _ ->
+                requireContext().startService(resultServiceIntent)
+                dismiss()
+            }
+            .create()
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        resultServiceIntent = requireArguments().getParcelable(EXTRA_RESULT_SERVICE_INTENT)!!
+    }
+
+    companion object {
+        private const val EXTRA_RESULT_SERVICE_INTENT = "extra_result_service_intent"
+
+        @JvmStatic
+        fun show(fragment: Fragment, resultServiceIntent: Intent) {
+            val dialog = ImportConfirmationDialog()
+            val args = Bundle()
+            args.putParcelable(EXTRA_RESULT_SERVICE_INTENT, resultServiceIntent)
+            dialog.setArguments(args)
+            dialog.show(fragment.getParentFragmentManager(), null)
+        }
+    }
+}