Increase minLines on disappearing messages duration dialog

This isn't foolproof across all translations, but it's probably
the best we can do.

Fixes #5746

// FREEBIE

res/layout/expiration_dialog.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 xmlns:app="http://schemas.android.com/apk/res-auto"
+                xmlns:tools="http://schemas.android.com/tools"
                 android:orientation="vertical"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -25,8 +26,9 @@
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:layout_below="@id/expiration_number_picker"
-              android:minLines="2"
-              android:padding="20dp"/>
+              android:minLines="3"
+              android:padding="20dp"
+              tools:text="Your messages will not expire."/>
 
 
 </RelativeLayout>