bot.exec: remove excessive newlines

src/modules/bot.js

@@ -122,10 +122,10 @@ exec.callback = async function (msg, line) {
   const proc = spawn(line);
   let out = `Spawned ${proc.pid}: \`${line}'\n`;
   proc.stdout.on("data", (data) => {
-    out += data + "\n";
+    out += data;
   });
   proc.stderr.on("data", (data) => {
-    out += data + "\n";
+    out += data;
   });
 
   proc.on("close", async (code) => {