Fix settings change picture video icon vertical alignment

The <div> wrappers for the icon were inheriting text height properties,
which are too tall in Arabic and when "Font Size" is "Very large".

Bug: 919059
Change-Id: Ic66d3b3194ed0060f8c1695825a9796195fbf1f6
Reviewed-on: https://chromium-review.googlesource.com/c/1484499
Commit-Queue: James Cook <jamescook@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634902}

ui/webui/resources/cr_elements/chromeos/cr_picture/cr_camera.html

@@ -104,6 +104,8 @@
       }
 
       #cameraControls > div {
+        height: 24px;
+        line-height: normal;
         margin: 0 12px;
         width: 24px;
       }