Fix issue with arrows not showing when MultiPV = 1

[ksthicke]

Purpose

Fixes #236

Pre-merge TODOs and Checks

• PGN file loads correctly
• Navigating through the move history works
• Starting the engine shows moves (test for both sides)
• Selecting a different variant loads a new board with the variant and you can make moves on the board
• In Crazyhouse the pocket pieces are shown and you can drop pieces

[ksthicke]

Now that I look at another part of the code, I think I might do this differently.