Fix goblint-lib-modules.py output

Author: sim642

scripts/goblint-lib-modules.py

@@ -65,5 +65,5 @@
 
 missing_modules = src_modules - goblint_lib_modules
 if len(missing_modules) > 0:
-    print(f"Modules missing from {goblint_lib_path}: {missing_modules}")
+    print(f"Modules missing from {goblint_lib_paths[0]}: {missing_modules}")
     sys.exit(1)