Update a message ID for wildly-elytron-mechanism-gssapi in ELY_Messages.txt

The range in gssapi/src/main/java/org/wildfly/security/mechanism/gssapi/ElytronMessages.java is @ValidIdRange(min = 3031, max = 3031), which is correct. So looks like 3035 in the text file should be updated to 3031.