Minor, fix this patch so it applies after channel got deleted from the event table.

Test plan: Applied the patch explicitly with `--apply`.

resources/sql/patches/20130218.updatechannelid.php

@@ -11,33 +11,46 @@ $event_table->beginReadLocking();
 $channel_table->beginReadLocking();
 
 $events = new LiskMigrationIterator($event_table);
+$conn_w = $channel_table->establishConnection('w');
 
 foreach ($events as $event) {
   if ($event->getChannelID()) {
     continue;
   }
 
-  $matched = $channel_table->loadOneWhere(
-    "channelName = %s AND serviceName = %s AND serviceType = %s",
-    $event->getChannel(),
+  $event_row = queryfx_one(
+    $conn_w,
+    'SELECT channel FROM %T WHERE id = %d',
+    $event->getTable(),
+    $event->getChannelID());
+  $event_channel = $event_row['channel'];
+
+  $matched = queryfx_one(
+    $conn_w,
+    'SELECT * FROM %T WHERE
+      channelName = %s AND serviceName = %s AND serviceType = %s',
+    $event_channel,
     '',
     '');
 
   if (!$matched) {
     $matched = id(new PhabricatorChatLogChannel())
-      ->setChannelName($event->getChannel())
+      ->setChannelName($event_channel)
       ->setServiceType('')
       ->setServiceName('')
       ->setViewPolicy(PhabricatorPolicies::POLICY_USER)
       ->setEditPolicy(PhabricatorPolicies::POLICY_USER)
       ->save();
+    $matched_id = $matched->getID();
+  } else {
+    $matched_id = $matched['id'];
   }
 
   queryfx(
     $event->establishConnection('w'),
     'UPDATE %T SET channelID = %d WHERE id = %d',
     $event->getTableName(),
-    $matched->getID(),
+    $matched_id,
     $event->getID());
 }