fix: issus with orthoslice meshes on m1 mac sonoma

some underlying platform issue with Apple Metal on M1 Mac Sonoma requires specular color to be specified for correct rendering of phong material meshes
see: https://forums.macrumors.com/threads/javafx-mesh-lighting-rendering-errors-macos-14-2-1.2415934/

src/main/java/org/janelia/saalfeldlab/paintera/viewer3d/OrthoSliceMeshFX.java

@@ -1,5 +1,6 @@
 package org.janelia.saalfeldlab.paintera.viewer3d;
 
+import javafx.scene.paint.Color;
 import javafx.scene.paint.PhongMaterial;
 import javafx.scene.shape.CullFace;
 import javafx.scene.shape.MeshView;
@@ -10,6 +11,7 @@
 import net.imglib2.RealLocalizable;
 import net.imglib2.RealPoint;
 import net.imglib2.RealPositionable;
+import org.janelia.saalfeldlab.paintera.meshes.Meshes;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -56,6 +58,9 @@ public class OrthoSliceMeshFX {
 
 	public OrthoSliceMeshFX(final long[] dimensions, final Affine viewerTransformFX) {
 
+		material.setSpecularColor(Color.TRANSPARENT);
+		material.setSpecularPower(0.0);
+
 		final Point min = new Point(2), max = new Point(dimensions);
 
 		final List<RealPoint> vertexPoints = calculateVertexPoints(min, max);