Fix size of CCA mode selector icons.

Fix size of mode selector icons to align with size in mock design.

Bug: 955572
Change-Id: I99c3bad102437929d166ddd59638c0ee6eab9e6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1580693
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Sheng-hao Tsao <shenghao@chromium.org>
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653515}

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

@@ -235,13 +235,13 @@ body.tablet-landscape .actions-group {
 }
 
 label.mode-item>span {
-  border-radius: 16px / 50%;
+  border-radius: 13px / 50%;
   color: white;
   display: inline-block;
   font-family: 'Roboto', sans-serif;
   font-size: 14px;
   font-weight: 500;
-  padding: 10px 15px;
+  padding: 8px 12px;
   text-shadow: 2px 3px 3px rgba(32, 33, 36, 0.3);
 }