Fixed UseMatrix being a string instead of boolean. This fixed listen to music activity.

src/index.ts

@@ -133,7 +133,7 @@ class HarmonyMatrixPlatform {
                     controlDeviceId: configActivity["ControlDevice"],
                     outputDeviceId: configActivity["OutputDevice"],
                     displayName: configActivity["DisplayName"],
-                    useMatrix: configActivity["UseMatrix"],
+                    useMatrix: configActivity["UseMatrix"] === "true" ? true : false,
                     deviceList: devices
                 }));
                 this.log(`INFO - Added activity '${configActivity["DisplayName"]}'`);