Remove second argument to ErrnoError. NFC

This was only passed in one 1 out of 199 call sites, and never read
(AFIACT).

Author: sbc100

src/library_fs.js

@@ -231,7 +231,7 @@ FS.staticInit();` +
     lookupNode(parent, name) {
       var errCode = FS.mayLookup(parent);
       if (errCode) {
-        throw new FS.ErrnoError(errCode, parent);
+        throw new FS.ErrnoError(errCode);
       }
       var hash = FS.hashName(parent.id, name);
 #if CASE_INSENSITIVE_FS
@@ -1408,15 +1408,14 @@ FS.staticInit();` +
     },
     ensureErrnoError() {
       if (FS.ErrnoError) return;
-      FS.ErrnoError = /** @this{Object} */ function ErrnoError(errno, node) {
+      FS.ErrnoError = /** @this{Object} */ function ErrnoError(errno) {
         // We set the `name` property to be able to identify `FS.ErrnoError`
         // - the `name` is a standard ECMA-262 property of error objects. Kind of good to have it anyway.
         // - when using PROXYFS, an error can come from an underlying FS
         // as different FS objects have their own FS.ErrnoError each,
         // the test `err instanceof FS.ErrnoError` won't detect an error coming from another filesystem, causing bugs.
         // we'll use the reliable test `err.name == "ErrnoError"` instead
         this.name = 'ErrnoError';
-        this.node = node;
         this.setErrno = /** @this{Object} */ function(errno) {
           this.errno = errno;
 #if ASSERTIONS

test/other/metadce/test_metadce_cxx_ctors1.gzsize

@@ -1 +1 @@
-9936
+9927

test/other/metadce/test_metadce_cxx_ctors1.jssize

@@ -1 +1 @@
-24683
+24667

test/other/metadce/test_metadce_cxx_ctors2.gzsize

@@ -1 +1 @@
-9921
+9909

test/other/metadce/test_metadce_cxx_ctors2.jssize

@@ -1 +1 @@
-24651
+24635

test/other/metadce/test_metadce_cxx_except.gzsize

@@ -1 +1 @@
-11015
+11003

test/other/metadce/test_metadce_cxx_except.jssize

@@ -1 +1 @@
-28573
+28557

test/other/metadce/test_metadce_cxx_except_wasm.gzsize

@@ -1 +1 @@
-9903
+9893

test/other/metadce/test_metadce_cxx_except_wasm.jssize

@@ -1 +1 @@
-24576
+24560

test/other/metadce/test_metadce_cxx_mangle.gzsize

@@ -1 +1 @@
-11021
+11010

test/other/metadce/test_metadce_cxx_mangle.jssize

@@ -1 +1 @@
-28573
+28557

test/other/metadce/test_metadce_cxx_noexcept.gzsize

@@ -1 +1 @@
-9936
+9927

test/other/metadce/test_metadce_cxx_noexcept.jssize

@@ -1 +1 @@
-24683
+24667

test/other/metadce/test_metadce_files_js_fs.gzsize

@@ -1 +1 @@
-7874
+7866

test/other/metadce/test_metadce_files_js_fs.jssize

@@ -1 +1 @@
-19705
+19689