POM: remove obsolete comment
POM: remove obsolete comment

The ImageJ repository is no longer included for the pom-scijava parent,
since pom-scijava is now available from Maven Central.

biovoxxel/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej