Fix W3C DC API problem

[hanluOMH]

Holder app after upgrade to 0.95, please check w3c DC API, depends on my test it didn't work.
I guess after the code is refactored, below code is never called(Just my guess)

          if (DigitalCredentials.Default.available) {
                //The credentials will still exist in your document store and can be used for other presentation mechanisms like proximity sharing (NFC/BLE), but they won't be accessible through the standardized digital credentials infrastructure that Android provides.
                DigitalCredentials.Default.startExportingCredentials(
                    documentStore = documentStore,
                    documentTypeRepository = documentTypeRepository
                )
                Logger.i(TAG, "DigitalCredentials.Default.startExportingCredentials")
            }

[TheBlackBit]

You are right I am working on it