Remove @SortDimensionId

The sort dimension ID can't be an @IntDef because the values are not
constant when DocumentsUI is compiled as a library so that it can be
compiled once for DocumentsUI and DocumentsUIGoogle.

Bug: 294256649
Test: m DocumentsUI
Change-Id: Ie6ddc3869c6f758b75a048a2e5fe2e0dc9305424