showSaveFilePicker resolves without prompting#59

I could have sworn I had this working correctly previously, but whenever I run the example code to `showSaveFilePicker`, the handle resolves immediately without prompting. I have the function being called from a click handler on a button in a SveltKit app. ```ts import { showSaveFilePicker } from "native-file-system-adapter"; const fileHandle = await showSaveFilePicker({ _preferPolyfill: false, suggestedName: "Untitled.png", types: [ { accept: { "image/png": ["png"] } }, { accept: { "image/jpg": ["jpg"] } }, { accept: { "image/webp": ["webp"] } }, ], excludeAcceptAllOption: false, // default }); console.log(fileHandle); // <- this is shown immediately ```