Use international format if region differs from default

[st4lk]

My use case:

1. "US" region by default
2. "National" format by default
3. but in case of non "US" phone number - use INTERNATIONAL format

1, 2 works fine:

PHONENUMBER_DEFAULT_REGION = 'US'
PHONENUMBER_DEFAULT_FORMAT = 'NATIONAL'

But if I'll submit an international phone number (e.g. "+79261234567") into django admin form for PhoneNumberField field - error will be shown that phone number is incorrect.
Internally, such PhoneNumber instance will be created:

PhoneNumber(country_code=1, national_number=89261234567, extension=None, italian_leading_zero=None, number_of_leading_zeros=None, country_code_source=20, preferred_domestic_carrier_code='')

Which doesn't look correct: instead of +7 region, +1 was applied.

This patch tends to fix it.

[ghost]

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