fix test_parallel_executor_seresnex timeout (#15812)

test=develop

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -113,12 +113,11 @@ py_test_modules(test_ir_memory_optimize_transformer MODULES test_ir_memory_optim
 endif()
 if(NOT APPLE)
     py_test_modules(test_image_classification_resnet MODULES test_image_classification_resnet SERIAL)
-    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
-        # change the timeout from 600 to 1200, because in debug mode, this test need more time.
-        set_tests_properties(test_image_classification_resnet PROPERTIES TIMEOUT 1200)
-    endif()
 endif()
-
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    # change the timeout from 600 to 1200, because in debug mode, this test need more time.
+    set_tests_properties(test_parallel_executor_seresnext PROPERTIES TIMEOUT 1200)
+endif()
 
 if (WITH_NGRAPH)
     add_subdirectory(ngraph)