fix: N5Viewer uses same base path inference as ij plugin

src/main/java/org/janelia/saalfeldlab/n5/bdv/N5ViewerCreator.java

@@ -114,7 +114,7 @@ public void openViewer(
 		final ExecutorService exec = Executors.newFixedThreadPool(ij.Prefs.getThreads());
 		final DatasetSelectorDialog dialog = new DatasetSelectorDialog(
 				new N5Importer.N5ViewerReaderFun(),
-				x -> "",
+				new N5Importer.N5BasePathFun(),
 				lastOpenedContainer,
 				n5vGroupParsers,
 				n5vParsers);