Day/Night lighting broken in 2D

It only orks sometimes depending on where the camera is

viewer.scene.globe.enableLighting = true;

[emackey]

I ran git bisect on this. It was introduced in either f924c16d220e or its parent commit 041ee30b2a6d (these are both work-in-progress commits). The parent of those commits b59067709 did not display the problem.

These commits were merged to the old models-2D branch as part of #3933, and that branch was later merged to master.

(For my own reference, what follows below is the Sandcastle snippet that was bisected)

var img = Cesium.createDefaultImageryProviderViewModels();
var len = img.length;

var viewer = new Cesium.Viewer('cesiumContainer', {
    imageryProviderViewModels: img,
    selectedImageryProviderViewModel: img[len - 1]
});
viewer.scene.globe.enableLighting = true;
viewer.scene.morphTo2D(0);

[hpinkos]

@sspeaks610 @cfairchi @jeffwhitty This was just fixed and will be included in the Cesium 1.49 release available September 3rd. Thanks!