notes: add icons to use previous/next event as template

app/src/main/res/layout/dialog_notes.xml

@@ -30,6 +30,7 @@
         android:layout_marginTop="5dp"
         android:gravity="end"
         android:orientation="horizontal">
+
         <TextView
             android:id="@+id/notes_template_prev"
             android:layout_width="wrap_content"
@@ -49,6 +50,7 @@
             android:layout_height="wrap_content"
             android:textSize="18dp"
             android:text="➡️"/>
+
     </LinearLayout>
 
 </LinearLayout>