BUG - MHR Phone number cursor moves to the end of the input field when editing a phone number (all forms)

When editing the phone number the cursor moves to the end of the input field without user placing it there.
Steps to reproduce:

1. Enter a complete phone number in Submitting Party or Owner
2. Erase the area code - enter a new area code
3. The cursor moves to the end of the input field after entering one or more characters

Impact: users may enter an incorrect phone number without realizing and we wouldn't be able to contact them.
Likelihood of occurrence: High

Reproduce the issue in the Submitting Party and Owner phone-number forms, following the listed steps while observing the cursor position. Trace the shared phone input handling used by those forms; done means editing the area code no longer moves the cursor to the end and the behavior is consistent across all forms.

Written by the indexing model from the issue text.