wininet: Don't clear the auth data for Basic authentication in HTTP_InsertAuthorizationForHeader.

[Robert Shearman]

It isn't tracked per connection, unlike NTLM authentication, and so the 
server will return a 401 error and try to get us to authenticate again. 
However, this doesn't work as the authentication information is assumed 
by the code to be valid for the whole connection.
---
  dlls/wininet/http.c |   13 +++++++++----
  1 files changed, 9 insertions(+), 4 deletions(-)
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