input_dark_mode() should consult html[data-bs-theme] before prefers-color-scheme

[gadenbuie]

We fall back to prefers-color-scheme but we should account for the document element having data-bs-theme set already, in which case we'd use that value over prefers-color-scheme.

bslib/srcts/src/components/webcomponents/inputDarkMode.ts

Lines 223 to 229 in 7ff88a1

	this.attribute = this.getAttribute("attribute") || this.attribute;
	if (typeof this.mode === "undefined") {
	this.mode = window.matchMedia("(prefers-color-scheme: dark)").matches
	? "dark"
	: "light";
	}