Added text for the negative state of a TTY number

[cndreisbach]

Previously, when adding a phone number, you had the choice of setting
the phone type to a blank line or "TTY". We have clarified this by
changing the choices to "Not a TTY number" or "TTY number". The values
set are the same as previously.

Resolves #196.

[monfresh]

Thanks! Could you please update the specs and convert the double quotes into single quotes?

You'll need to:

• Add if options[:number_type] to the end of this line.
• Change the value of number_type to TTY number in update_phone_numbers_spec and in create_location_spec.
• Add a new spec in the feature 'Update phones' section at the bottom of update_phone_number_spec to test that the initial value of the dropdown is Not a TTY number.

Please remember to run script/test to check your work.

[cndreisbach]

Thanks for the feedback! I've pushed a new commit with all those changes.

[monfresh]

Thanks!