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Fix incorrect gpio_free_array usage (#339)

The gpio_free_array function was incorrectly passed ARRAY_SIZE(leds)
when freeing the 'buttons' array in multiple examples:
- examples/intrp.c
- examples/bottomhalf.c
- examples/bh_halfthreaded.c

This mismatch could lead to invalid memory access if the size of
'buttons' differs from 'leds'.

Updated all occurrences to use ARRAY_SIZE(buttons) for correctness.

Co-authored-by: EricccTaiwan <[email protected]>
Signed-off-by: Jordan Chiu <[email protected]>