Ensure all Workers have a public WorkManager constructor.

src/org/thoughtcrime/securesms/jobs/AttachmentUploadJob.java

@@ -48,7 +48,7 @@ public class AttachmentUploadJob extends ContextJob implements InjectableType {
   private AttachmentId               attachmentId;
   @Inject SignalServiceMessageSender messageSender;
 
-  protected AttachmentUploadJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
+  public AttachmentUploadJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
     super(context, workerParameters);
   }
 

src/org/thoughtcrime/securesms/jobs/ContextJob.java

@@ -13,7 +13,7 @@ public abstract class ContextJob extends Job implements ContextDependent {
 
   protected transient Context context;
 
-  protected ContextJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
+  public ContextJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
     super(context, workerParameters);
   }
 

src/org/thoughtcrime/securesms/jobs/SendJob.java

@@ -31,7 +31,7 @@ public abstract class SendJob extends ContextJob {
   @SuppressWarnings("unused")
   private final static String TAG = SendJob.class.getSimpleName();
 
-  protected SendJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
+  public SendJob(@NonNull Context context, @NonNull WorkerParameters workerParameters) {
     super(context, workerParameters);
   }