Full with for audio UI (#2877)

#fix https://github.com/FreshRSS/FreshRSS/issues/2875

p/themes/Alternative-Dark/template.css

@@ -93,10 +93,14 @@ img.favicon {
 }
 
 /*=== Videos */
-iframe, embed, object, video {
+audio, iframe, embed, object, video {
 	max-width: 100%;
 }
 
+audio {
+	width: 100%;
+}
+
 /*=== Forms */
 legend {
 	display: block;

p/themes/Alternative-Dark/template.rtl.css

@@ -93,10 +93,14 @@ img.favicon {
 }
 
 /*=== Videos */
-iframe, embed, object, video {
+audio, iframe, embed, object, video {
 	max-width: 100%;
 }
 
+audio {
+	width: 100%;
+}
+
 /*=== Forms */
 legend {
 	display: block;

p/themes/base-theme/template.css

@@ -93,10 +93,14 @@ img.favicon {
 }
 
 /*=== Videos */
-iframe, embed, object, video {
+audio, iframe, embed, object, video {
 	max-width: 100%;
 }
 
+audio {
+	width: 100%;
+}
+
 /*=== Forms */
 legend {
 	display: block;

p/themes/base-theme/template.rtl.css

@@ -93,10 +93,14 @@ img.favicon {
 }
 
 /*=== Videos */
-iframe, embed, object, video {
+audio, iframe, embed, object, video {
 	max-width: 100%;
 }
 
+audio {
+	width: 100%;
+}
+
 /*=== Forms */
 legend {
 	display: block;