Cleanup android editable to android inputType to use valid phone number

[CalebKL]

This PR updates android:editable which has been deprecated to use android: inputType on the Contact phone number TextField. This would ensure the user would enter a valid phone number.

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Fixes #1001 🦕

[davkutalek]

@Mzazi25 the StaxDropdownLayout is used by more than just the contact input, so this likely breaks some of its usages. The use of editable is to change it between a freeform input with autocomplete options and a regular dropdown with only preset options. Even the contact case it is more complicated: if a contact is chosen from the address book then it shows the contact's name in the input field.

@jumaallan is in the middle of converting the entire flow to compose anyway, so probably not worth the time to try to sort out the different use cases or get rid of the depreciated editable option

[CalebKL]

@davkutalek thanks for clearing that up. Appreciate it. I will close the PR