Let AttachmentUploadJob handle retrying

This way we can better handle e.g. authorization issues

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

@@ -52,7 +52,7 @@ public class AttachmentUploadJob extends BaseJob implements InjectableType {
     this(new Job.Parameters.Builder()
                            .addConstraint(NetworkConstraint.KEY)
                            .setLifespan(TimeUnit.DAYS.toMillis(1))
-                           .setMaxAttempts(1)
+                           .setMaxAttempts(5)
                            .build(),
          attachmentId, destination);
   }