Make Glanceable Hub selection and drag & drop RTL compatible.

This changelist adjust Glanceable Hub logic to treat offset from the
layout start location on selection. This changelist also adjust drag
logic to treat offset in the layout direction.

Bug: 320786721
Test: manual - verified selection and drag and drop worked in RTL
Flag: com.android.systemui.scene_container
Change-Id: Ibbf68aa96973c620b10e332cd6a85ccfec356de1