review: consistency use isAudioCall everywhere (instead of voiceOnly)

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/widget/CallWidgetSettingsProvider.kt

@@ -16,7 +16,7 @@ interface CallWidgetSettingsProvider {
         widgetId: String = UUID.randomUUID().toString(),
         encrypted: Boolean,
         direct: Boolean,
-        voiceOnly: Boolean,
+        isAudioCall: Boolean,
         hasActiveCall: Boolean,
     ): MatrixWidgetSettings
 }