fix: fix hanging process in the record dialog: ignore stdio for spawn

the older version of noir was producing more warnings, and probably
this might have led to overfilling the stderr buffer like here:

https://stackoverflow.com/questions/20792427/why-is-my-node-child-process-that-i-created-via-spawn-hanging/20792428#20792428

src/frontend/lib.nim

@@ -434,7 +434,12 @@ when defined(ctIndex) or defined(ctTest):
       # debugPrint "OPTIONS: ", $(options.to(cstring))
 
       setupLdLibraryPath()
-      let process = nodeStartProcess.spawn(path, args, options)
+
+      var processOptions = options
+      # important to ignore stderr, as otherwise too much of it can lead to
+      # the spawned process hanging: this is a bugfix for such a situation
+      processOptions.stdio = cstring"ignore"
+      let process = nodeStartProcess.spawn(path, args, processOptions)
 
       process.stdout.setEncoding(cstring"utf8")