Fix CMakeLists.txt - proper if/else/endif nesting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-benchmark/tests/CMakeLists.txt

@@ -66,6 +66,7 @@ if(BUILD_TESTING)
         gtest_discover_tests(migration_tests)
         
         message(STATUS "Migration tests enabled: ${EXISTING_SOURCES}")
-else()
-    message(WARNING "No migration test sources found in ${CMAKE_CURRENT_SOURCE_DIR}")
+    else()
+        message(WARNING "No migration test sources found in ${CMAKE_CURRENT_SOURCE_DIR}")
+    endif()
 endif()