Core: Avoid including modules_enabled in headers

modules/gdscript/tests/test_lsp.h

@@ -32,6 +32,10 @@
 
 #ifdef TOOLS_ENABLED
 
+#include "modules/modules_enabled.gen.h" // For jsonrpc.
+
+#ifdef MODULE_JSONRPC_ENABLED
+
 #include "tests/test_macros.h"
 
 #include "../language_server/gdscript_extend_parser.h"
@@ -506,4 +510,6 @@ func f():
 
 } // namespace GDScriptTests
 
+#endif // MODULE_JSONRPC_ENABLED
+
 #endif // TOOLS_ENABLED