fix dddb tag for Upgrade_BdKstgamma_XDIGI
There was an extra space at the end which resulted in an error:
ToolSvc.GitDDDB.sysInitialize FATAL Exception with tag=ToolSvc.GitDDDB is caught
ToolSvc.GitDDDB.sysInitialize ERROR ToolSvc.GitDDDB cannot resolve commit upgrade/dddb-20190223 : failed to parse revision specifier - Invalid pattern 'upgrade/dddb-20190223 ' StatusCode=FAILURE