Some bugs in the `request.ts` file

[hangedfish]

not_expire is the same as is_expire in the request.ts file. This is a bug.

wasm-micro-runtime/assembly-script/wamr_app_lib/request.ts

Lines 125 to 141 in e53ab91

	function is_expire(trans: wamr_transaction, index: i32, array: Array<wamr_transaction>): bool {
	var now = timer.now();
	var elapsed_ms = (now < trans.time) ?
	(now + (0xFFFFFFFF - trans.time) + 1) : (now - trans.time);
	return elapsed_ms >= TRANSACTION_TIMEOUT_MS;
	}
	function not_expire(trans: wamr_transaction, index: i32, array: Array<wamr_transaction>): bool {
	var now = timer.now();
	var elapsed_ms = (now < trans.time) ?
	(now + (0xFFFFFFFF - trans.time) + 1) : (now - trans.time);
	return elapsed_ms >= TRANSACTION_TIMEOUT_MS;
	}

[hangedfish]

another bug in the request.ts file.

COAP_PUT -> COAP_DELETE

wasm-micro-runtime/assembly-script/wamr_app_lib/request.ts

Lines 386 to 391 in e53ab91

	export function del(url: string, tag: string,
	cb: (resp: wamr_response) => void): void {
	var req = new wamr_request(g_mid++, url, COAP_PUT, 0, new ArrayBuffer(0), 0);
	do_request(req, cb);
	}

[xujuntwt95329]

Thanks a lot for reporting this, we've fixed in #1597