Allow signal exit bid-ask spread filter

If you check Allow signal override next to Exit bid-ask spread filter, then bidAskSpreadFilter in the webhook (when present) is used as the exit spread cap for that signal. If the key is omitted, the Exit bid-ask spread filter saved on the strategy or subscription is used.

If Allow signal overrides is enabled, bidAskSpreadFilter is also honored for exit planning even when Allow signal override for Exit bid-ask spread filter is unchecked.

Example:

{
    "ticker": "AAPL",
    "action": "exit",
    "bidAskSpreadFilter": 0.02
}