NamespacePreprocessor: fix really stupid bug

How did this work before...?

This commit is dedicated to Tim-Oliver Buchholz.

src/main/java/net/imagej/ops/NamespacePreprocessor.java

@@ -74,7 +74,7 @@ private <T> void assignNamespace(final Module module,
 		// if possible, extract the OpEnvironment from the delegate object
 		final Object delegate = module.getDelegateObject();
 		final OpEnvironment env = delegate instanceof Environmental ? //
-			(OpEnvironment) delegate : ops;
+			((Environmental) delegate).ops() : ops;
 		if (env == null) return;
 
 		T defaultValue = null;