move start time up one hour

DartConfig.cmake

 # Dashboard is opened for submissions for a 24 hour period starting at
 # the specified NIGHLY_START_TIME. Time is specified in 24 hour format.
-SET (NIGHTLY_START_TIME "22:00:00 EDT")
+SET (NIGHTLY_START_TIME "21:00:00 EDT")
 
 # Dart server to submit results (used by client)
 IF(DROP_METHOD MATCHES http)