[DocsUI M3] Update sort arrow icon

Previously we use the arrow_down icon for the sort arrow, it should
be arrow_up icon instead, the icon direction is controlled by the
<rotate> element in ic_sort_arrow.xml.

Check the attached bug for the demo.

Bug: 416371565
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I67ca97e9f1eab44f790d8e66fe926f1e805eaad1