Downgrade ij: 1.54h -> 1.54g

We cannot update to 1.54h due to a potentially critical bug in
the handling of virtual stacks when combined with ImgLib2; see:

imglib/imglib2-ij#39

Author: ctrueden

pom.xml

@@ -472,7 +472,7 @@
 		<net.imagej.imagej.version>${imagej.version}</net.imagej.imagej.version>
 
 		<!-- ImageJ - https://github.com/imagej/ImageJ -->
-		<imagej1.version>1.54h</imagej1.version>
+		<imagej1.version>1.54g</imagej1.version>
 		<ij.version>${imagej1.version}</ij.version>
 		<net.imagej.ij.version>${ij.version}</net.imagej.ij.version>