JS: simplify charpred for NodeJS::Require

Author: esbena

javascript/ql/src/semmle/javascript/NodeJS.qll

@@ -163,11 +163,9 @@ private predicate moduleInFile(Module m, File f) { m.getFile() = f }
  */
 class Require extends CallExpr, Import {
   Require() {
-    exists(RequireVariable req |
-      this.getCallee() = req.getAnAccess() and
-      // `mjs` files explicitly disallow `require`
-      not getFile().getExtension() = "mjs"
-    )
+    any(RequireVariable req).getAnAccess() = getCallee() and
+    // `mjs` files explicitly disallow `require`
+    not getFile().getExtension() = "mjs"
   }
 
   override PathExpr getImportedPath() { result = getArgument(0) }