[CCA] Hide switch device button when reviewing intent result.

Bug: None
Test: Verify the switch device button is not shown on both photo/video
intent reviewing page.

Change-Id: I1575f4775690f12b4d28405f51226c877bab96a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1859318
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705505}

chrome/browser/resources/chromeos/camera/src/css/main.css

@@ -274,6 +274,7 @@ body.should-handle-intent-result #modes-group {
   width: 72px;
 }
 
+body.review-result #switch-device,
 body.review-result #preview-video,
 body:not(.review-result) #confirm-result-groups,
 body:not(.review-photo-result) #review-photo-result,