Fixed login bug.
Fixed login bug.

Since the profile and connections waterfall chains/browsers start up a
short time after each other, LinkedIn's servers see two devices trying to
login at approximately the same time, which is indicative of suspicious
(read, bot-like) activity. So, one of the browsers will not complete
login.
To fix this, I changed the wait condition to a time (1800-ms) rather than
a selector.

SaiWebApps/node-linkedin-scraper,SaiWebApps/node-linkedin-scraper