Bug 29762: (follow-up) Change field names from phone to primary phone

Bug 29762: (follow-up) Change field names from phone to primary phone

This change is made in order to make sure that the labels on the
normal patron form and the batch patron edit tool match up.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 3f80a0fcf74be12bb12f249d79139df29455f4a5)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 853ced5fa1f2a9d203e977de318b51407f121323)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>