Set correct accessibility description for manage button

We were accidentally using the description from the clear all button...

Bug: 293167744
Test: select the buttons with talkback to make sure the description is correct
Flag: ACONFIG com.andoid.systemui.notifications_footer_view_refactor STAGING
Change-Id: I08962dcfd09a9d3a3c7e06b00ec7d7bbd5560963