iOS: Fixed up remaining RCT_USE_HERMES usage --> USE_HERMES

Summary:
facebook#41625 cleaned up some usages, but there are some remaining ones.

Changelog: [Fixed][iOS] Further cleaned up RCT_USE_HERMES

Differential Revision: D52555309

packages/react-native/Libraries/AppDelegate/RCTAppSetupUtils.h

@@ -15,18 +15,15 @@
 
 #import <memory>
 
-#ifndef RCT_USE_HERMES
+#if USE_HERMES
 #if __has_include(<jsireact/HermesExecutorFactory.h>)
 #import <jsireact/HermesExecutorFactory.h>
-#define RCT_USE_HERMES 1
 #elif __has_include(<reacthermes/HermesExecutorFactory.h>)
 #import <reacthermes/HermesExecutorFactory.h>
-#define RCT_USE_HERMES 1
-#else
-#import <React/JSCExecutorFactory.h>
-#define RCT_USE_HERMES 0
-#endif
 #endif
+#else // USE_HERMES
+#import <React/JSCExecutorFactory.h>
+#endif // USE_HERMES
 
 #import <ReactCommon/RCTTurboModuleManager.h>
 

packages/react-native/Libraries/AppDelegate/RCTAppSetupUtils.mm

@@ -107,11 +107,11 @@ void RCTAppSetupPrepareApp(
   [turboModuleManager moduleForName:"RCTDevMenu"];
 #endif // end RCT_DEV
 
-#if RCT_USE_HERMES
+#if USE_HERMES
   return std::make_unique<facebook::react::HermesExecutorFactory>(
 #else
   return std::make_unique<facebook::react::JSCExecutorFactory>(
-#endif // end RCT_USE_HERMES
+#endif // USE_HERMES
       facebook::react::RCTJSIExecutorRuntimeInstaller(
           [turboModuleManager, bridge, runtimeScheduler](facebook::jsi::Runtime &runtime) {
             if (!bridge || !turboModuleManager) {
@@ -128,11 +128,11 @@ void RCTAppSetupPrepareApp(
     RCTBridge *bridge,
     const std::shared_ptr<facebook::react::RuntimeScheduler> &runtimeScheduler)
 {
-#if RCT_USE_HERMES
+#if USE_HERMES
   return std::make_unique<facebook::react::HermesExecutorFactory>(
 #else
   return std::make_unique<facebook::react::JSCExecutorFactory>(
-#endif // end RCT_USE_HERMES
+#endif // USE_HERMES
       facebook::react::RCTJSIExecutorRuntimeInstaller([bridge, runtimeScheduler](facebook::jsi::Runtime &runtime) {
         if (!bridge) {
           return;