Fix optimum-cli command for VLM example in README #5681

Job	Run time
cpp-beam_search_causal_lm-notus-7b-v1	31m 6s
cpp-beam_search_causal_lm-Phi-2	16m 11s
cpp-beam_search_causal_lm-Qwen1_5-7B-Chat	33m 52s
cpp-beam_search_causal_lm-ubuntu (./build/samples/cpp/beam_search_causal_lm/beam_search_causal_lm)	19m 18s
cpp-greedy_causal_lm-Qwen-7B-Chat	10m 27s
cpp-greedy_causal_lm-windows	25m 30s
cpp-beam_search_causal_lm-ubuntu (python ./samples/python/beam_search_causal_lm/beam_search_causa...	19m 7s
cpp-multinomial-greedy_causal_lm-ubuntu	18m 14s
cpp-chat_sample-ubuntu	16m 8s
cpp-continuous-batching-macos	21m 55s
cpp-continuous-batching-ubuntu	13m 56s
cpp-continuous-batching-windows	23m 23s
cpp-greedy_causal_lm-redpajama-3b-chat	11m 27s
cpp-Phi-1_5	8m 35s
cpp-prompt_lookup_decoding_lm-ubuntu	15m 25s
cpp-speculative_decoding_lm-ubuntu	13m 2s
visual_language_chat_sample-ubuntu-internvl2	22m 58s
visual_language_chat_sample-ubuntu-minicpm_v2_6	6m 55s
visual_language_chat_sample-ubuntu-llava_1_5 / visual_language_chat_sample-ubuntu-llava	30m 41s
visual_language_chat_sample-ubuntu-llava_next / visual_language_chat_sample-ubuntu-llava	36m 5s
ci/gha_overall_status_causal_lm	1s
	6h 34m 16s

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