Partial Formatter with "US" default region breaks for phone numbers starting with "3"

### New Issue Checklist

- [X] Updated PhoneNumberKit to the latest version
- [X] Phone number formatted correctly on [JavaScript version](https://htmlpreview.github.io/?https://github.com/google/libphonenumber/blob/master/javascript/i18n/phonenumbers/demo-compiled.html)
- [X] I searched for [existing GitHub issues](https://github.com/marmelroy/PhoneNumberKit)

### Steps to reproduce
Using PartialFormatter, set the default region to US, and start entering a phone number beginning with "3"

##### Expected result
Formats to "3"

##### Actual result
Formats to "(3"

### Environment
SPM


### Notes
- All other numbers appear to format correctly.
- Numbers beginning with "3" also format correctly when the country code is provided before the "3".
- Tested on the javascript version with the number "3362530000" and AsYouTypeFormatter Results are correct.
- I updated the testUSTollFreeNumber() unit test to start with a "3" instead of an "8". This caused the test to fail, same reasoning as expected result and actual result note. Adding updated test below

```    func testUSTollFreeNumber() {
        let partialFormatter = PartialFormatter(phoneNumberKit: phoneNumberKit, defaultRegion: "US")
        var testNumber = "3"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "3")
        testNumber = "33"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "33")
        testNumber = "336"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "336")
        testNumber = "3362"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "336-2")
        testNumber = "33625"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "336-25")
        testNumber = "336253"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "336-253")
        testNumber = "3362530"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "336-2530")
        testNumber = "33625300"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "(336) 253-00")
        testNumber = "336253000"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "(336) 253-000")
        testNumber = "3362530000"
        XCTAssertEqual(partialFormatter.formatPartial(testNumber), "(336) 253-0000")
    }
```

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Partial Formatter with "US" default region breaks for phone numbers starting with "3" #714

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Partial Formatter with "US" default region breaks for phone numbers starting with "3" #714

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