[TextField] Convert autoCompleteTextView's onTouchListener to onClickListener.

[kelvinwatson]

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ACTION_DOWN and ACTION_UP are both triggered on click, resulting in duplicate touch calls being handled. Changing over to an onClickListener mitigates this issue

Resolves https://github.com/material-components/material-components-android/issues/2840

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[leticiarossi]

Please see comments in https://github.com/material-components/material-components-android/issues/2840, closing this for now