Revert "[E2E] Make DimmingDialog edge to edge compatible"

This reverts commit 399b7b314246c5bb228321f820e1ec572214ae4c.

Reason for revert: broke tests in automotive builder:
crbug.com/443811396

Bug: 443336220,443811396
Original change's description:
> [E2E] Make DimmingDialog edge to edge compatible
>
> Marking DimmingDialog `isDialogFullscreen=true` and set the nav bar and
> status bar color to make it look edge to edge.
>
> * Light: https://screenshot.googleplex.com/AzjegVhtw4coR2j
> * Dark: https://screenshot.googleplex.com/6v46x8hoBANL3Bb
> * Incognito: https://screenshot.googleplex.com/7QEY2u66pjdUVPR
>
> Bug: 443336220
> Change-Id: I367b179ce14ae5f438d3e0c48e3e877c30b2bf94
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6920025
> Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
> Reviewed-by: Joel Tan-Aristy <jtanaristy@google.com>
> Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1512640}

Bug: 443336220
Change-Id: Ib64c672a01fff14c758666694f0516188011ab85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6927074
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Salvador Guerrero Ramos <salg@google.com>
Owners-Override: Salvador Guerrero Ramos <salg@google.com>
Commit-Queue: Salvador Guerrero Ramos <salg@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1512759}