Use new Material Design tools in wizard

vlc-android/AndroidManifest.xml

@@ -500,7 +500,7 @@
         <activity
             android:name=".gui.wizard.MLWizardActivity"
             android:configChanges="orientation|screenSize"
-            android:theme="@style/Theme.AppCompat.Light.Dialog"
+            android:theme="@style/Theme.MaterialComponents.Light.Dialog"
             android:label="@string/ml_wizard_title"/>
 
         <service android:name=".extensions.ExtensionManagerService" />

vlc-android/res/layout/ml_wizard_activity.xml

@@ -7,22 +7,24 @@
     android:layout_height="wrap_content"
     android:padding="16dp">
 
-    <CheckBox
+    <android.support.design.chip.Chip
         android:id="@+id/wizard_check_scan"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="16dp"
         android:checked="true"
+        android:checkable="true"
         android:text="@string/ml_wizard_scan_checkbox"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/wizard_description" />
 
-    <Button
+    <android.support.design.button.MaterialButton
         android:id="@+id/wizard_validate"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:onClick="apply"
         android:text="@string/ok"
+        android:layout_marginTop="16dp"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/wizard_check_scan"