show quiz action icons on touch devices

The Edit, Delete, and Move action icons for a question in the quiz edit
form were not visible on touch-enabled devices as the CSS would only
show them based on the :hover state of their container which isn't
always eligible when using touch devices.

The issue was reported by some users using Chrome and Firefox on a
regular non-touch device, however I was unable to reproduce the issue
on any of the following platforms/browsers:

Windows 7 (x64)
	Chrome:  17.0.963.83,  18.0.1025.168, 19.0.1084.56, 20.0.1132.57,
           21.0.1180.89, 22.0.1229.94,  23.0.1271.97, 24.0.1312.57
  Firefox: 3.6.28, 4.0.1, 5.0.1, 17.0.1, 18.0.2

Windows 8 (x64)
  Chrome:  24.0.1312.57
  Firefox: 18.0.2

Linux (Arch x64)
  Chromeium: 24.0.1312.69
  Google Chrome: 23.0.1271.64
  Firefox: 18.0.2

However, the issue was reproducible on:
  1. iPhone 4S (iOS 6)
  2. iPad 4 (iOS 6.1)

-- NOTE --

The committed change will apply to "hybrid" browsers which may report
both touch and no-touch capabilities by FALLING BACK to the touch mode
(the icons will be visible regardless of the hover state). So, they will
be accessible but not optimal.

-- Test plan

  * create a quiz with one or two questions
  * using an iPad or an iPhone, edit the quiz
  * look at the question containers, the edit and delete buttons to the
    right should be shown, and the move icon to the left as well
  * using a desktop (or any no-touch device) browser, edit the quiz
    and the icons should be hidden unless you hover over the question

closes CNVS-2022
see also CNVS-6966
see also gerrit-8825 (https://gerrit.instructure.com/#/c/8825/)

Change-Id: If8c8221523ce11fc469e19fe58e9337b8bcd635c
Reviewed-on: https://gerrit.instructure.com/17679
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
QA-Review: Myller de Araujo <myller@instructure.com>

Author: amireh

app/stylesheets/quizzes.sass

@@ -440,7 +440,9 @@ div#content
   &.marked,&.marked:hover
     .flag_question
       :background-position -48px -17px
-  .no-touch &.hover
+
+  .no-touch &.hover,
+  .touch    &
     .move
       :background-color #fff
       .move_icon