CCA: Shorten video shutter buttons distance to 84px

Shorten the distance from center of video shutter button to center of
video snapshot and pause button from 100px to 84px.

Bug: 1054314
Test: None

Change-Id: Ic772a79146ad97e8c6ce8efadef23729d06d9407
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246358Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#778596}

chromeos/components/camera_app_ui/resources/src/css/main.css

@@ -341,7 +341,7 @@ body.should-handle-intent-result #pause-recordvideo {
 }
 
 #video-snapshot-holder {
-  bottom: calc(var(--shutter-vertical-center) + 100px);
+  bottom: calc(var(--shutter-vertical-center) + 84px);
   transform: translate(50%, 50%);
 }
 
@@ -379,7 +379,7 @@ body.should-handle-intent-result #pause-recordvideo {
 }
 
 #pause-recordvideo-holder {
-  bottom: calc(var(--shutter-vertical-center) - 100px);
+  bottom: calc(var(--shutter-vertical-center) - 84px);
   transform: translate(50%, 50%);
 }