Update test-tinystories-executorch: Disable config mobile-32, fix typo #2540

Job	Run time
test-advanced-mps-macos / macos-job	6m 57s
test-evaluation-mps-macos / macos-job	6m 37s
test-gguf-mps-macos / macos-job	6m 41s
test-multimodal-mps-macos / macos-job	42s
test-native-mps-macos / macos-job	1m 48s
test-quantization-mps-macos / macos-job	39m 19s
test-readme-mps-macos / macos-job	1m 52s
	1h 3m 56s

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