Unload model shaders and textures

They are not automatically unloaded when unloading the model!

examples/models/models_mesh_generation.c

@@ -115,11 +115,12 @@ int main(void)
 
     // De-Initialization
     //--------------------------------------------------------------------------------------
+    UnloadTexture(texture); // Unload texture
 
     // Unload models data (GPU VRAM)
     for (int i = 0; i < NUM_MODELS; i++) UnloadModel(models[i]);
 
-    CloseWindow();        // Close window and OpenGL context
+    CloseWindow();          // Close window and OpenGL context
     //--------------------------------------------------------------------------------------
 
     return 0;