tx-io: use the right key on received blob metadata identify method.

Following 5e8f843a82.

src/ChamiloLMS/Transaction/Envelope.php

@@ -160,7 +160,7 @@ class Envelope
      *
      * @return array
      *   An array with the metadata. Contains the following keys:
-     *   - 'type': The wrapper plugin machine name.
+     *   - 'blob_type': The wrapper plugin machine name.
      *   - 'origin_branch_id': The branch where the blob was generated.
      */
     public static function identifyBlobMetadata($blob) {

src/ChamiloLMS/Transaction/TransactionLogController.php

@@ -188,7 +188,7 @@ class TransactionLogController
             try {
                 $blob_metadata = Envelope::identifyBlobMetadata($row['data']);
                 $origin_branch = $this->branchRepository->find($blob_metadata['origin_branch_id']);
-                $wrapper_plugin = self::createPlugin('wrapper', $blob_metadata['type'], $origin_branch->getPluginData('wrapper'));
+                $wrapper_plugin = self::createPlugin('wrapper', $blob_metadata['blob_type'], $origin_branch->getPluginData('wrapper'));
                 $envelope_data = array('blob' => $blob, 'origin_branch_id' => $blob_metadata['origin_branch_id']);
                 $envelope = new Envelope($wrapper_plugin, $envelope_data);
                 $envelope->unwrap();
@@ -567,7 +567,7 @@ class TransactionLogController
             try {
                 $blob_metadata = Envelope::identifyBlobMetadata($blob);
                 $origin_branch = $this->branchRepository->find($blob_metadata['origin_branch_id']);
-                $wrapper_plugin = self::createPlugin('wrapper', $blob_metadata['type'], $origin_branch->getPluginData('wrapper'));
+                $wrapper_plugin = self::createPlugin('wrapper', $blob_metadata['blob_type'], $origin_branch->getPluginData('wrapper'));
                 $envelope_data = array('blob' => $blob, 'origin_branch_id' => $blob_metadata['origin_branch_id']);
                 $envelope = new Envelope($wrapper_plugin, $envelope_data);
             }