Add missing function for test

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/androidTest/java/com/owncloud/android/files/services/FileUploaderIT.kt

@@ -44,6 +44,7 @@ abstract class FileUploaderIT : AbstractOnServerIT() {
 
         override fun isInternetWalled(): Boolean = false
         override fun getConnectivity(): Connectivity = Connectivity.CONNECTED_WIFI
+        override fun clearCachedResult() = Unit
     }
 
     private val powerManagementServiceMock: PowerManagementService = object : PowerManagementService {