bug: Window resizing doesn't update input length line break

[MentalGear]

First off: Thx for this very handy and smart autoresize svelte plugin!

I just found this bug: When resizing the browser viewport (ex: w. 500) to something larger (ex: w. 800), and the textarea also has its width expanded from this, autoresize-textarea hasn't updated for the new width of the textarea, and will expand still at the old width (about 2/3 of the width of the textarea) instead of the new.