Fixed the PhoneNumberFilter to use the returned value from Replace(), making PhoneNumberFilterTests.Filter_PhoneNumberIsScrubbed() green.
Fixed the PhoneNumberFilter to use the returned value from Replace(), making PhoneNumberFilterTests.Filter_PhoneNumberIsScrubbed() green.

xpicio/raven-csharp,getsentry/raven-csharp,xpicio/raven-csharp,webaction/raven-csharp,getsentry/raven-csharp,asbjornu/raven-csharp,getsentry/raven-csharp