server: HTTP signature requires date header

The default of the library used is to require either of the "date" or
"x-date" headers. It does not seem sensible to pass on this default.
It may be to fix federation with another software but that software
should be considered broken, and it does not seem reasonable to
potentially get an outdated signature just to fix federation with some
buggy software.

packages/backend/src/server/activitypub.ts

@@ -28,7 +28,7 @@ function inbox(ctx: Router.RouterContext): void {
 	let signature;
 
 	try {
-		signature = httpSignature.parseRequest(ctx.req, { 'headers': [] });
+		signature = httpSignature.parseRequest(ctx.req);
 	} catch (e) {
 		ctx.status = 401;
 		return;