[CCA] Remove fps selection icon

BUG: 976602
TEST: On device with constant 30/60 fps capability, the icon is not
shown in video mode.

Change-Id: I400144e25105a619ea3aff88ddfea0731d9128cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717502
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680746}

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

@@ -460,8 +460,7 @@ body._10sec #toggle-timer:checked {
   background-image: url(../images/camera_button_mic_off.svg);
 }
 
-body:not(.multi-fps) #toggle-fps,
-body:not(.video-mode) #toggle-fps {
+#toggle-fps {
   display: none;
 }