Update Hotseat icons adjustment X calculation based on cell X Index

Resolved an issue where the X translation for hotseat icons was computed
using the view index in the parent, leading to misaligned adjustments.
The logic has been updated to calculate translation based on the cell X
index, ensuring more accurate positioning and alignment.

Fixes: 380794616
Test: Manual. Have a bubble in landscape orientation. Drag any item from
the hotseat to the workspace, then rotate the device.
Flag: com.android.wm.shell.enable_bubble_bar

Change-Id: Ibd0709e6c58ad9c1470de469cfced8bbe66fd30b