Fix command line test

`testRegularExpressionsMatch_ms` and `testRegularExpressionsMatch_mx` failed because regular expressions that manage `-Xms` and `-Xmx` flags respectively were updated, while the tests were not (see [L85-86](https://github.com/sladeware/groningen/blob/master/src/main/java/org/arbeitspferde/groningen/experimentdb/CommandLine.java#L85)).