Add press and focus state to event_info buttons

Bug: 5933822 EventInfo - Delete, Edit, Add Reminder don't have a on-press state.
Change-Id: I83fde90fbfa388e69e460353ed650a399349cb29
diff --git a/res/layout/event_info_dialog.xml b/res/layout/event_info_dialog.xml
index 68c1e5b..9aa5889 100644
--- a/res/layout/event_info_dialog.xml
+++ b/res/layout/event_info_dialog.xml
@@ -100,7 +100,7 @@
                             android:layout_marginTop="8dip"
                             android:layout_marginRight="16dip"
                             style="?android:attr/buttonBarButtonStyle"
-                            android:background="@drawable/ic_menu_compose_holo_dark" />
+                            android:background="@drawable/event_info_compose_button" />
                         <Button
                             android:id="@+id/delete"
                             android:layout_width="32dip"
@@ -109,7 +109,7 @@
                             android:layout_marginLeft="16dip"
                             android:layout_weight="1"
                             style="?android:attr/buttonBarButtonStyle"
-                            android:background="@drawable/ic_menu_trash_holo_dark" />
+                            android:background="@drawable/event_info_delete_button" />
                     </LinearLayout>
                 </LinearLayout>