Checked monitor prefs on "next game" on Overview

Resolves #1144.

http://jenkins.buttonweavers.com:8080/job/buttonmen-AdmiralJota/405/
Again, this is duplicating a bunch of code in a here function between `Login.nextGameRefreshCallback()` and the "preference" option of Overview.showOverviewPage().  In this case, since the code has nontrivial logic in it and we'll get future bugs if it's not duplicated perfectly, my preference would be for it to be moved to a named function before merging this pull.