Got rid of unused dependency

Signed-off-by: Nico Piel <nico.piel@hotmail.de>

Author: NicoPiel

server/src/com/mirth/connect/client/core/api/providers/CalendarParamConverterProvider.java

@@ -22,7 +22,6 @@
 import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
 import java.util.Calendar;
-import java.util.Date;
 
 @Provider
 @Singleton