Tiny patch fixing some issues:

• Fix systems without a checkpoint station but for which the player has a system map still don't show their gates in the system details.
• Known (but not discovered) planets and stations now show with a different icon in the system details (to distinguish them from completely unknown system locations) and can be clicked to set the destination to them.
• Fix ship turning is cancelled (very noticeable when using controller) when flying over an undiscovered site.