Fix InspectorFlags debug default, clean up legacy Buck opt in (facebo…

…ok#48504)

Summary:
Pull Request resolved: facebook#48504

Following D67857739, fixes accidental change where the removed `ReactNativeFeatureFlags` flag read was not replaced with `true`. This temporarily disabled Fusebox on `main`, where not configured via other build flags.

{F1974195736}

Changelog: [Internal]

Reviewed By: robhogan

Differential Revision: D67857739

fbshipit-source-id: 2a6fb2e6733035245e7ad959c7d3c650a9fde994

packages/react-native/ReactCommon/jsinspector-modern/InspectorFlags.cpp

@@ -51,8 +51,7 @@ const InspectorFlags::Values& InspectorFlags::loadFlagsAndAssertUnchanged()
           true,
 #elif defined(REACT_NATIVE_FORCE_DISABLE_FUSEBOX)
           false,
-#elif defined(HERMES_ENABLE_DEBUGGER) && \
-    defined(REACT_NATIVE_ENABLE_FUSEBOX_DEBUG)
+#elif defined(HERMES_ENABLE_DEBUGGER)
           true,
 #elif defined(REACT_NATIVE_ENABLE_FUSEBOX_RELEASE)
           true,