Only check for 'black' and '#000000'

Author: Joshua Campbell

src/sage/ext_data/threejs/threejs_template.html

@@ -125,7 +125,7 @@
     function addLabel( text, x, y, z, color='black', fontsize=14 ) {
 
         if ( options.theme === 'dark' )
-            if ( color === 'black' || color === '#000' || color === '#000000' )
+            if ( color === 'black' || color === '#000000' )
                 color = 'white';
 
         var canvas = document.createElement( 'canvas' );