fixed small issue with seed parameter on watershed separation

src/main/java/plugins/stef/roi/bloc/op/SeparateROIWatershed.java

@@ -13,6 +13,7 @@ import icy.plugin.interface_.PluginLibrary;
 import icy.roi.ROI;
 import icy.roi.ROIUtil;
 import icy.system.IcyHandledException;
+import icy.type.collection.CollectionUtil;
 import icy.type.dimension.Dimension3D;
 import icy.type.dimension.Dimension5D;
 import icy.type.rectangle.Rectangle5D;
@@ -69,7 +70,7 @@ public class SeparateROIWatershed extends Plugin implements ROIBlock, PluginLibr
             {
                 if (seeds != null && seeds.length > 0)
                 {
-                    seedList = Arrays.asList(seeds);
+                    seedList = CollectionUtil.asArrayList(seeds);
                     result = ROIUtil.computeWatershedSeparation(Arrays.asList(rois), seedList, getDimensionSize(rois),
                             new Dimension3D.Double(1d, 1d, 1d));
                 }