guard GlobeCustomLayerHost.deinitialize() against uninitialized state

deinitialize() can be called without initialize() when using the
Vulkan backend since custom layers are not supported. Check
lateinit property before accessing to prevent crash.

GitOrigin-RevId: e1f9867645af1196aa40ce0099e0343fbe702f47

Author: pengdev

app/src/main/java/com/mapbox/maps/testapp/examples/customlayer/globe/GlobeCustomLayerHost.kt

@@ -389,6 +389,7 @@ class GlobeCustomLayerHost(
   override fun contextLost() = logW(TAG, "contextLost")
 
   override fun deinitialize() {
+    if (!::globeProgram.isInitialized) return
     globeProgram.deinitialize()
     simpleProgram.deinitialize()
     glDeleteBuffers(vbo.buffer.size, vbo.buffer, 0)