Update activity_list_item.xml

Remove android:maxLines="3" to see long subtitles of notifications.

src/main/res/layout/activity_list_item.xml

@@ -60,7 +60,6 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:ellipsize="end"
-            android:maxLines="3"
             android:text="@string/placeholder_sentence"
             android:textColor="?android:attr/textColorSecondary"/>
 
@@ -84,4 +83,4 @@
 
     </LinearLayout>
 
-</RelativeLayout>
+</RelativeLayout>