[CCA] Fix portrait mode option participate layout when hidden bug.

Bug: 994258
Test: Test on device without portrait mode, the mode selector should not
be scrollable.
Change-Id: Ic8a154a705b4bb62dafb296d11a9a3dd92149820

Change-Id: Ie3a79185a266f87abdace599944fc883965b770b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818895
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699247}

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

@@ -259,11 +259,14 @@ div.mode-item>span {
   z-index: 0;
 }
 
-#modes-group.hide,
-.mode-item.hide {
+#modes-group.hide {
   visibility: hidden;
 }
 
+.mode-item.hide {
+  display: none;
+}
+
 .mode-item>input {
   height: 100%;
   position: absolute;