Core: change start inventory from pool to warn when nothing to remove

[qwint]

What is this fixing or adding?

makes start inventory from pool warn and fixes the itempool to match when it can not find a matching item to remove

How was this tested?

lightly, Generate a Lingo game with:

  start_inventory_from_pool:
    # Start with these items and don't place them in the world.
    # The game decides what the replacement items will be.
    {"Black": 2}

see screenshots

and with {"Black": 3} once i noticed my math was off

and with {"Black": 500} once it was noticed that a previous iteration was popping from the entire itempool not just the new filler

If this makes graphical changes, please attach screenshots.

previous error

new warning