extmod/btstack: Reset pending_value_handle before calling write-done cb.

The pending_value_handle needs to be freed and reset before calling
mp_bluetooth_gattc_on_read_write_status(), which will call the Python IRQ
handler, which may in turn call back into BTstack to perform an action like
a write.  In that case the pending_value_handle will need to be available
for the write/read/etc to proceed.

Fixes issue #13611.

Signed-off-by: Damien George <damien@micropython.org>

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