Fix how the bug report code accesses Slack API key setting

It was trying to access this setting as an attribute, which doesn't
work anymore. (Not sure if this is an API change in conf.settings or
just a bug.)

CHANGELOG.md

@@ -15,6 +15,7 @@ at anytime.
  * call stopProducing in reflector client file_sender when uploading is done
  * ensure streams in stream_info_manager are saved in lbry_file_manager
  * [#470](https://github.com/lbryio/lbry/issues/470)
+ * Fixed upload of bug reports to Slack ([#472](https://github.com/lbryio/lbry/issues/472))
 
 ## [0.8.1] - 2017-02-01
 ### Changed

lbrynet/lbrynet_daemon/Daemon.py

@@ -2679,7 +2679,7 @@ def get_loggly_query_string(installation_id):
 
 
 def report_bug_to_slack(message, installation_id, platform_name, app_version):
-    webhook = utils.deobfuscate(conf.settings.SLACK_WEBHOOK)
+    webhook = utils.deobfuscate(conf.settings['SLACK_WEBHOOK'])
     payload_template = "os: %s\n version: %s\n<%s|loggly>\n%s"
     payload_params = (
         platform_name,