x11/ashell: Fix disappearance on HDMI display reconnect/power-on

When an HDMI display is reconnected/powered-on after
disconnection/power-off, ashell status bar disappears while the
process is still running. By changing the event (Created ->
InfoUpdate) used for triggering redraw of status bar appears to solve
the problem.

(cherry picked from commit ff1cf76fa9ee49546cd4d428ee97b120d8dbb0ef)