Fix bug in non-true-color code

There was a bug caused by 38781d931ec18304f51ed3469faff8387e3cbc55
which prevented color map look-ups sent by rfb.js from working properly,
since display.js expected a single-item array, and rfb.js sent just them
item value itself (a number) instead.  This fixes that, and tweaks the
corresponding test to match that behavior.

include/display.js

@@ -667,7 +667,7 @@ var Display;
             if (this._true_color) {
                 bgr = color;
             } else {
-                bgr = this._colourMap[color[0]];
+                bgr = this._colourMap[color];
             }
 
             var newStyle = 'rgb(' + bgr[2] + ',' + bgr[1] + ',' + bgr[0] + ')';

tests/test.display.js

@@ -353,9 +353,9 @@ describe('Display/Canvas Helper', function () {
             it('should support drawing solid colors with color maps', function () {
                 display._true_color = false;
                 display.set_colourMap({ 0: [0xff, 0, 0], 1: [0, 0xff, 0] });
-                display.fillRect(0, 0, 4, 4, [1]);
-                display.fillRect(0, 0, 2, 2, [0]);
-                display.fillRect(2, 2, 2, 2, [0]);
+                display.fillRect(0, 0, 4, 4, 1);
+                display.fillRect(0, 0, 2, 2, 0);
+                display.fillRect(2, 2, 2, 2, 0);
                 expect(display).to.have.displayed(checked_data);
             });