lib: remove redundant code from timers.js
insert() is only called from one place where there is already a check that msecs is greater than or equal to zero, so do not repeat the check inside insert().
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
insert() is only called from one place where there is already a check that msecs is greater than or equal to zero, so do not repeat the check inside insert().