(ITS#8778) Phone numbers "-" and " " fail normalization

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: 2.4.45, master
OS: Linux x86_64
URL: 
Submission from: (NULL) (193.90.52.167)
Submitted by: hallvard


telephoneNumberNormalize() fails for a non-empty value
of only spaces+hyphens.  The validate function,
printableStringValidate(), succeeds.  They should agree.

I'll make Normalize return one space.  That seems the
minimal change.