Remove unused function that caused build errors.

Corona-Warn-App/src/main/java/de/rki/coronawarnapp/diagnosiskeys/download/DownloadDiagnosisKeysTask.kt

@@ -15,13 +15,10 @@ import de.rki.coronawarnapp.task.TaskFactory
 import de.rki.coronawarnapp.task.TaskFactory.Config.CollisionBehavior
 import de.rki.coronawarnapp.util.TimeStamper
 import de.rki.coronawarnapp.util.ui.toLazyString
-import de.rki.coronawarnapp.worker.BackgroundWorkHelper
 import kotlinx.coroutines.channels.ConflatedBroadcastChannel
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.asFlow
 import kotlinx.coroutines.flow.first
-import org.joda.time.DateTime
-import org.joda.time.DateTimeZone
 import org.joda.time.Duration
 import org.joda.time.Instant
 import timber.log.Timber
@@ -168,25 +165,6 @@ class DownloadDiagnosisKeysTask @Inject constructor(
         LocalData.lastTimeDiagnosisKeysFromServerFetch(currentDate)
     }
 
-    private fun noKeysFetchedToday(): Boolean {
-        val currentDate = DateTime(timeStamper.nowUTC, DateTimeZone.UTC)
-        val lastFetch = DateTime(
-            LocalData.lastTimeDiagnosisKeysFromServerFetch(),
-            DateTimeZone.UTC
-        )
-        return (LocalData.lastTimeDiagnosisKeysFromServerFetch() == null ||
-            currentDate.withTimeAtStartOfDay() != lastFetch.withTimeAtStartOfDay()).also {
-            if (it) {
-                Timber.tag(TAG)
-                    .d("No keys fetched today yet (last=%s, now=%s)", lastFetch, currentDate)
-                BackgroundWorkHelper.sendDebugNotification(
-                    "Start Task",
-                    "No keys fetched today yet \n${DateTime.now()}\nUTC: $currentDate"
-                )
-            }
-        }
-    }
-
     private fun rollback(rollbackItems: MutableList<RollbackItem>) {
         try {
             Timber.tag(TAG).d("Initiate Rollback")