fix: lever l'ambiguité sur les balises simples des `url()` suite à la...

fix: lever l'ambiguité sur les balises simples des `url()` suite à la comprehension plus large des balises étendues par le phraseur

Refs: spip#3637
(cherry picked from commit 7bb8943e)

prive/style_prive_plugin_medias.html

@@ -59,9 +59,9 @@
 	background-position: #LEFT var(--spip-tabs-spacing-x) center;
 	background-repeat: no-repeat;
 }
-.onglets_simple .medias .image > * { background-image: url(#CHEMIN_IMAGE{media-image-16.png}); }
-.onglets_simple .medias .audio > * { background-image: url(#CHEMIN_IMAGE{media-audio-16.png}); }
-.onglets_simple .medias .video > * { background-image: url(#CHEMIN_IMAGE{media-video-16.png}); }
+.onglets_simple .medias .image > * { background-image: url("#CHEMIN_IMAGE{media-image-16.png}"); }
+.onglets_simple .medias .audio > * { background-image: url("#CHEMIN_IMAGE{media-audio-16.png}"); }
+.onglets_simple .medias .video > * { background-image: url("#CHEMIN_IMAGE{media-video-16.png}"); }
 
 .choix-type, .choix-type li {display:inline;list-style:none;margin:0;padding:0;}
 .choix-type {margin:1em 0;padding:0;}
@@ -81,13 +81,13 @@ a.bouton_fermer {display:block;text-align:#GET{right};}
 	background-position: var(--spip-left) var(--spip-list-spacing-x) center;
 }
 .liste-objets.galerie.media-image .caption {
-	background-image: url(#CHEMIN_IMAGE{media-image-32.png});
+	background-image: url("#CHEMIN_IMAGE{media-image-32.png}");
 }
 .liste-objets.galerie.media-audio .caption {
-	background-image: url(#CHEMIN_IMAGE{media-audio-32.png});
+	background-image: url("#CHEMIN_IMAGE{media-audio-32.png}");
 }
 .liste-objets.galerie.media-video .caption {
-	background-image: url(#CHEMIN_IMAGE{media-video-32.png});
+	background-image: url("#CHEMIN_IMAGE{media-video-32.png}");
 }
 
 /* Colonne logo */