Small Weekend Fix Patch

I fixed a few bugs, here they are:

• A constellation appeared invisible once purchased, and after quitting and returning to the menu. Now, it is properly visible.
  
• Fixed an issue with selling constellations when the next milestone was purchased. Now, you can sell it until the constellation reaches level 1.
  
• Fixed the loading bug of the magic save constellation, which will now load correctly if you quit and restart the game.