Fix CaptureModeSettingsTest.hdr_supports_image_only assertions

[davidjiagoogle]

Description

Fixes assertion logic in CaptureModeSettingsTest.hdr_supports_image_only and adds hdr_toggle_maintains_video_capture_mode().

Key Nuances & Updates:

• Device Hardware Nuance: On devices supporting both HLG10 Video and Ultra HDR (such as Pixel 10 Pro), enabling HDR does not disable the capture mode toggle button because both image and video modes remain supported under HDR. The test uses assume().that(isCaptureModeToggleEnabled()).isTrue() / isFalse() to safely handle device capability variations.
• Assertion Fixes in hdr_supports_image_only:
  • Corrects the post-HDR assertion to verify that captureMode remains CaptureMode.IMAGE_ONLY when HDR is turned off, as disabling HDR restores format selection but does not alter explicit capture mode selection.
  • Verifies that the capture mode toggle UI is enabled once HDR is turned off.
• Added hdr_toggle_maintains_video_capture_mode(): Adds a test verifying that when HDR is enabled on devices supporting multi-stream HDR, toggling capture mode successfully switches to CaptureMode.VIDEO_ONLY.

[gemini-code-assist]

Code Review

This pull request updates CaptureModeSettingsTest.kt by replacing assume() calls with assertThat() assertions. It also updates the test assertions after disabling HDR to verify that the capture mode toggle becomes enabled and the capture mode setting state is CaptureMode.IMAGE_ONLY. I have no feedback to provide as there are no review comments.