fix: spécifier le chemin du sprite svg des controles du player

Ref: https://github.com/mediaelement/mediaelement/blob/master/MIGRATION.md#migrating-from-4x-to-5x-version

modeles/audio.html

@@ -19,7 +19,7 @@
   	       src="#URL_DOCUMENT"
   	       type="#MIME_TYPE"
   	       preload="none"
-  	       data-mejsoptions='{"alwaysShowControls": true[,"loop":(#ENV{loop}|?{true,false})],"audioWidth":"100%"[,"audioHeight":"(#ENV{hauteur})"][,"startVolume":"(#ENV{volume})"][,"duration":(#GET{duree})]}'
+  	       data-mejsoptions='{["iconSprite": "(#CHEMIN{lib/mejs/mejs-controls.svg})",]"alwaysShowControls": true[,"loop":(#ENV{loop}|?{true,false})],"audioWidth":"100%"[,"audioHeight":"(#ENV{hauteur})"][,"startVolume":"(#ENV{volume})"][,"duration":(#GET{duree})]}'
   	       controls="controls"
   				 [autoplay="autoplay"(#ENV{autoplay}|oui)]></audio>
   </div>

modeles/video.html

@@ -18,7 +18,7 @@
 	<div class="video-wrapper" style="position: absolute;top:0;left:0;width:100%;height:100%;">
 		<video class="mejs mejs-#ID_DOCUMENT[ mejs-(#ENV{skin})]"
 				data-id="[(#VAL{mejs-#ID_DOCUMENT}|concat{#ENV{skin}}|md5)]"
-				data-mejsoptions='{"alwaysShowControls": true,"pluginPath":"[(#CHEMIN{lib/mejs/mediaelement-flash-video.swf}|dirname)/]"[,"loop":(#ENV{loop}|?{true,false})],"videoWidth":"100%","videoHeight":"100%"[,"startVolume":"(#ENV{volume})"][,"duration":(#GET{duree})]}'
+				data-mejsoptions='{["iconSprite": "(#CHEMIN{lib/mejs/mejs-controls.svg})",]"alwaysShowControls": true,"pluginPath":"[(#CHEMIN{lib/mejs/mediaelement-flash-video.swf}|dirname)/]"[,"loop":(#ENV{loop}|?{true,false})],"videoWidth":"100%","videoHeight":"100%"[,"startVolume":"(#ENV{volume})"][,"duration":(#GET{duree})]}'
 				width="100%"
 				height="100%"[
 				poster="(#LOGO_DOCUMENT{vignette}|image_reduire{#GET{largeur},0}|extraire_attribut{src})"]