Refactor audio file player

- Do not play if there is no context available (e.g. unit testing)

lib/helpers.dart

@@ -8,8 +8,7 @@
  */
 
 import "package:audioplayers/audioplayers.dart";
-
-import "package:inventree/preferences.dart";
+import "package:one_context/one_context.dart";
 
 String simpleNumberString(double number) {
   // Ref: https://stackoverflow.com/questions/55152175/how-to-remove-trailing-zeros-using-dart
@@ -17,22 +16,19 @@ String simpleNumberString(double number) {
   return number.toStringAsFixed(number.truncateToDouble() == number ? 0 : 1);
 }
 
-Future<void> successTone() async {
+/*
+ * Play an audio file from the requested path.
+ *
+ * Note: If OneContext module fails the 'hasConext' check,
+ *       we will not attempt to play the sound
+ */
+Future<void> playAudioFile(String path) async {
 
-  final bool en = await InvenTreeSettingsManager().getValue(INV_SOUNDS_BARCODE, true) as bool;
-
-  if (en) {
-    final player = AudioCache();
-    player.play("sounds/barcode_scan.mp3");
+  if (!OneContext.hasContext) {
+    return;
   }
+
+  final player = AudioCache();
+  player.play(path);
+
 }
-
-Future <void> failureTone() async {
-
-  final bool en = await InvenTreeSettingsManager().getValue(INV_SOUNDS_BARCODE, true) as bool;
-
-  if (en) {
-    final player = AudioCache();
-    player.play("sounds/barcode_error.mp3");
-  }
-}