remove redundant tests in layer helper's unittest.

Author: lcy-seso

python/paddle/trainer_config_helpers/tests/configs/file_list.sh

@@ -11,7 +11,6 @@ test_recursive_topology test_gated_unit_layer test_clip_layer test_row_l2_norm_l
 test_kmax_seq_socre_layer test_sub_nested_seq_select_layer test_scale_shift_layer
 test_seq_slice_layer test_cross_entropy_over_beam test_roi_pool_layer test_pooling3D_layer
 test_conv3d_layer test_deconv3d_layer test_BatchNorm3D test_resize_layer
-test_conv3d_layer test_deconv3d_layer test_BatchNorm3D test_resize_layer
 test_scale_sub_region_layer test_dot_prod_layer test_l2_distance_layer)
 
 export whole_configs=(test_split_datasource)