Fix example for getEnsemblIds

[Richard Cotton]

From Martin Morgan:

When I run example(getEnsemblIds) the example returns an empty list() (as does the \dontrun chunk). Is this intended? (maybe in getData() SeqId should be SomaId?) Please ensure that all example code returns expected values.

[Richard Cotton]

fixed via https://bitbucket.org/graumannlabtools/readat/commits/a31f9a8276b53d26b49564f2bbd111bd80be042d