fix new logic to calculator with required and optional subjects

app/Http/Controllers/Api/CalculatorController.php

@@ -45,7 +45,7 @@ class CalculatorController extends Controller
                 }, true);
             })
             ->filter(function ($subjectTypes) use ($calcultatorSubjects) {
-                if(array_key_exists(2, $subjectTypes)) {
+                if (array_key_exists(2, $subjectTypes)) {
                     $optionalSubjectsInCalculator = collect($subjectTypes[2])
                         ->filter(fn($optionalSubject) => in_array($optionalSubject, $calcultatorSubjects));
                     return $optionalSubjectsInCalculator->count() !== 0;