Change EXPID for the event generator example.

examples/03_event-generator.sh

 #!/bin/bash
 #######################################################################################################################
 # Variables that are required to define the test case
-EXPID="eg"
+EXPID="eg000"
 ICON_CASE="event-generator"
 ICON_VERSION="2.6.5-nwp0"
 PLATFORM="LOCAL"