vm,lib: refactor microtaskQueue assignment logic

Simplify the assignment of the `microtaskQueue` variable in the `vm`
module by replacing the conditional block with a more concise ternary
operator. This change improves code readability and maintainability.
PR-URL: #47765
Reviewed-By: theanarkh <theratliter@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: XadillaX

lib/vm.js

@@ -236,14 +236,12 @@ function createContext(contextObject = {}, options = kEmptyObject) {
 validateBoolean(wasm,'options.codeGeneration.wasm');
 }
 
-letmicrotaskQueue=null;
-if(microtaskMode!==undefined){
-validateOneOf(microtaskMode,'options.microtaskMode',
-['afterEvaluate',undefined]);
-
-if(microtaskMode==='afterEvaluate')
-microtaskQueue=newMicrotaskQueue();
-}
+validateOneOf(microtaskMode,
+'options.microtaskMode',
+['afterEvaluate',undefined]);
+constmicrotaskQueue=microtaskMode==='afterEvaluate' ?
+newMicrotaskQueue() :
+null;
 
 makeContext(contextObject,name,origin,strings,wasm,microtaskQueue);
 returncontextObject;