account export: tv: fix account export crash

Use AlertDialog instead of MaterialAlertDialogBuilder.
The latter needs Theme.AppCompat which is not compatible with Leanback.

GitLab: #1324
Change-Id: If71d4dc341d4a33f14c9a6d6ba9b774012b2d095

jami-android/app/src/main/java/cx/ring/tv/account/TVAccountExport.kt

@@ -30,7 +30,6 @@ import android.text.style.StyleSpan
 import android.view.View
 import androidx.leanback.widget.GuidanceStylist.Guidance
 import androidx.leanback.widget.GuidedAction
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import cx.ring.R
 import cx.ring.databinding.ItemProgressDialogBinding
 import cx.ring.utils.AndroidFileUtils.getMimeType
@@ -43,7 +42,7 @@ import java.io.File
 
 @AndroidEntryPoint
 class TVAccountExport : JamiGuidedStepFragment<JamiAccountSummaryPresenter, JamiAccountSummaryView>(), JamiAccountSummaryView {
-    private var mWaitDialog: androidx.appcompat.app.AlertDialog? = null
+    private var mWaitDialog: AlertDialog? = null
     private lateinit var mIdAccount: String
     private var mHasPassword = false
 
@@ -83,7 +82,7 @@ class TVAccountExport : JamiGuidedStepFragment<JamiAccountSummaryPresenter, Jami
     }
 
     override fun showExportingProgressDialog() {
-        mWaitDialog = MaterialAlertDialogBuilder(requireContext())
+        mWaitDialog = AlertDialog.Builder(requireActivity())
         .setView(ItemProgressDialogBinding.inflate(layoutInflater).root)
         .setTitle(R.string.export_account_wait_title)
         .setMessage(R.string.export_account_wait_message)