video: sort frame rates from highest to lowest

Change-Id: Ib98e0e3877b17a1d5653ef617a88a354640cf629
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>

src/video/device.cpp

@@ -69,11 +69,11 @@ d_ptr(new VideoDevicePrivate(this))
             }
          }
 
-         // Sort rates in increasing order.
+         // Sort rates in decreasing order.
          qSort(res->d_ptr->m_lValidRates.begin(),
          res->d_ptr->m_lValidRates.end(),
          [](Video::Rate* rateA, Video::Rate* rateB) {
-             return rateA->name().toInt() > rateB->name().toInt();
+             return rateA->name().toInt() < rateB->name().toInt();
          });
       }
 
@@ -199,7 +199,6 @@ Video::Channel* Video::Device::activeChannel() const
    return d_ptr->m_pCurrentChannel;
 }
 
-
 void VideoDevicePrivate::saveIdle()
 {
    m_RequireSave = false;