Updates the example-web-client to fix a mis-named variable
Updates the example-web-client to fix a mis-named variable

H/T to @misterdai

slackapi/node-slack-sdk,peernohell/node-slack-client,slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackhq/node-slack-sdk,slackhq/node-slack-client,slackapi/node-slack-sdk,peernohell/node-slack-client