The sign economy GUI type closes the trade

[NeoSaysMeow]

Describe the bug
If you set the config for the trading GUI to be SIGN instead of the default ANVIL, pressing DONE when an amount is written in the sign cancels an ongoing trade.
This does not produce an error log either - My guess is that the GUI thinks you intentionally closed it.

To Reproduce
1.21.4 Minecraft, running on Purpur, TradeSystem v2.6.3, with Input_GUI config set to SIGN, attempt to input a value into an essentials economy button.

Expected behavior
It probably shouldn't close the trade.