[BC-25] Update CollapsingToolbar left margin.

The icon image already contains left spacing which is 16dp, so adding the additional 8dp on the left.

HSV: https://hsv.googleplex.com/5174446888321024

Bug: 393248917
Test: manual
Flag: com.android.settings.flags.settings_expressive_design_enabled
Change-Id: I7749c1c850ee11b0a796df60a1b8e9aa6dcabf12