Should not block wait on promises (#824)

libsession/src/main/java/org/session/libsession/messaging/jobs/AttachmentDownloadJob.kt

@@ -11,6 +11,7 @@ import org.session.libsession.messaging.sending_receiving.attachments.Attachment
 import org.session.libsession.messaging.sending_receiving.attachments.DatabaseAttachment
 import org.session.libsession.messaging.utilities.Data
 import org.session.libsession.snode.OnionRequestAPI
+import org.session.libsession.snode.utilities.await
 import org.session.libsession.utilities.DecodedAudio
 import org.session.libsession.utilities.DownloadUtilities
 import org.session.libsession.utilities.InputStreamMediaDataSource
@@ -136,7 +137,7 @@ class AttachmentDownloadJob(val attachmentID: Long, val databaseMessageID: Long)
                 Log.d("AttachmentDownloadJob", "downloading open group attachment")
                 val url = attachment.url.toHttpUrlOrNull()!!
                 val fileID = url.pathSegments.last()
-                OpenGroupApi.download(fileID, openGroup.room, openGroup.server).get().let {
+                OpenGroupApi.download(fileID, openGroup.room, openGroup.server).await().let {
                     tempFile.writeBytes(it)
                 }
             }