Do not truncate office phones in finger's summary listing

Do not truncate office phones in finger's summary listing

When finger is invoked as as "finger username", it produces the
long listing by default, and phones numbers are pretty-printed
by the prphone() function. When invoked as just "finger", the
same pretty-printing happens, but is truncated at 9 characters.
Given the summary listing is already greater than 80 columns,
making it even wider is of no harm.

Approved by:	rpaulo (mentor)
Differential Revision:	https://reviews.freebsd.org/D5638