GLRenderer: use luminance instead of intensity in compare R to texture

jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java

@@ -1885,7 +1885,6 @@ public class GLRenderer implements Renderer {
             // R to Texture compare mode
             if (tex.getShadowCompareMode() != Texture.ShadowCompareMode.Off) {
                 gl2.glTexParameteri(target, GL2.GL_TEXTURE_COMPARE_MODE, GL2.GL_COMPARE_R_TO_TEXTURE);
-                gl2.glTexParameteri(target, GL2.GL_DEPTH_TEXTURE_MODE, GL2.GL_INTENSITY);
                 if (tex.getShadowCompareMode() == Texture.ShadowCompareMode.GreaterOrEqual) {
                     gl2.glTexParameteri(target, GL2.GL_TEXTURE_COMPARE_FUNC, GL.GL_GEQUAL);
                 } else {