use loader in LinkedIdViewFragment

OpenKeychain/src/main/res/layout/linked_id_view_fragment.xml

@@ -40,6 +40,14 @@
                 android:id="@+id/linked_id_certs">
                 </LinearLayout>
 
+            <LinearLayout
+                android:layout_width="fill_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical"
+                android:animateLayoutChanges="true"
+                android:id="@+id/linked_id_verify">
+            </LinearLayout>
+
             <org.sufficientlysecure.keychain.ui.widget.CertifyKeySpinner
                 android:layout_marginLeft="14dp"
                 android:layout_marginRight="14dp"