lib/wasm: utf8 is an invalid param for TextEncoder

[SamuelMarks]

As per https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder or more specifically https://www.w3.org/TR/2020/NOTE-encoding-20200602/#ref-for-dom-textencoder

PS: This is a two line commit, I have an additional 1-line commit I can add to this if you like:

diff --git a/lib/wasm/wasm_exec.js b/lib/wasm/wasm_exec.js
index 11ac5a0..3754a89 100644
--- a/lib/wasm/wasm_exec.js
+++ b/lib/wasm/wasm_exec.js
@@ -18,7 +18,7 @@
 			writeSync(fd, buf) {
 				outputBuf += decoder.decode(buf);
 				const nl = outputBuf.lastIndexOf("\n");
-				if (nl != -1) {
+				if (nl !== -1) {
 					console.log(outputBuf.substring(0, nl));
 					outputBuf = outputBuf.substring(nl + 1);
 				}

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