[roll] Roll fuchsia [ffx-emu] Support screenshots in headless mode for QEMU

Enable the virtual GPU and use '-display none' instead of '-nographic'
for QEMU in headless mode. This keeps the virtual framebuffer active,
allowing screenshots to work in remote and CI/CQ environments.

Also align emulator resolution with device configuration by explicitly
passing window size and GPU resolution parameters. This overrides
AEMU's default 1280x720 fallback for non-AVD (Fuchsia) launches, which
otherwise occurs when running in headless mode.

Original-Original-Bug: 515058742

Test: fx test ffx_emulator_engines_lib_test
Test: fx test src/developer/ffx/plugins/emulator/commands/screenshot
Test: Manual verification matrix on ffx target ssh display-tool squares:
  - QEMU +      Desktop + Non-Headless: display-tool info/squares (OK)
  - QEMU +      Desktop +     Headless: display-tool info/squares (OK)
  - QEMU + SSH (No GUI) + Non-Headless: display-tool info/squares (OK)
  - QEMU + SSH (No GUI) +     Headless: display-tool info/squares (OK)
  - FEMU +      Desktop + Non-Headless: display-tool info/squares (OK)
  - FEMU +      Desktop +     Headless: display-tool info/squares (OK)
  - FEMU + SSH (No GUI) + Non-Headless: Expected failure (no window system)
  - FEMU + SSH (No GUI) +     Headless: display-tool info/squares (OK)

Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1622254
Original-Original-Revision: f881afb90116029c9a4254a10304b571226f8bef
GitOrigin-RevId: fd15e899ed9270e646d631fd4babdd212a796ae0
Change-Id: I0e7e4aee329d539f67c1cb892f7a96e6628a0727
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1628095
Cr-Commit-Position: refs/heads/main@{#193506}