[VL] Following #5889, correct / simplify the table indenting algorithm

[zhztheplayer]

The patch just corrects the identing algorithm of #5889.

[github-actions]

Run Gluten Clickhouse CI

[JkSelf]

LGTM. Thanks.

[GlutenPerfBot]

===== Performance report for TPCH SF2000 with Velox backend, for reference only ====

query	log/native_5917_time.csv	log/native_master_05_29_2024_588faae35_time.csv	difference	percentage
q1	34.02	33.56	-0.457	98.66%
q2	24.10	23.85	-0.248	98.97%
q3	37.09	37.37	0.279	100.75%
q4	32.06	32.42	0.360	101.12%
q5	69.09	69.83	0.746	101.08%
q6	7.06	7.54	0.482	106.83%
q7	80.56	81.75	1.193	101.48%
q8	73.12	86.57	13.445	118.39%
q9	112.18	118.35	6.166	105.50%
q10	46.79	44.16	-2.631	94.38%
q11	20.51	22.23	1.723	108.40%
q12	23.05	26.72	3.671	115.93%
q13	53.55	53.60	0.051	100.09%
q14	20.68	17.59	-3.091	85.05%
q15	35.62	32.89	-2.732	92.33%
q16	12.22	13.41	1.182	109.67%
q17	99.62	103.62	3.999	104.01%
q18	145.19	144.53	-0.661	99.54%
q19	13.19	13.59	0.400	103.04%
q20	30.08	29.66	-0.425	98.59%
q21	256.98	260.43	3.442	101.34%
q22	13.79	13.84	0.051	100.37%
total	1240.56	1267.50	26.945	102.17%