Remove no-longer needed integration test configuration for ij-legacy

The integration tests moved to ij1-patcher...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Do not override the ImageJ 1.x version for ij-legacy

We used to require an out-of-line version of ImageJ 1.x that had a bug
fix regarding redirecting error messages. By now, an even newer ImageJ
1.x version (containg a couple of regression fixes, too) made it into
pom-scijava, therefore we do not need to override the dependency version
any longer.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>