bitbucket: use the correct token type

Now that Bitbucket access tokens are allowed to be case to credentials, start returning them from `OAuthAuthenticator`.

Author: whoisj

Bitbucket.Authentication/Src/OAuth/OAuthAuthenticator.cs

@@ -323,7 +323,7 @@ private Token FindAccessToken(string responseText)
                 && tokenMatch.Groups.Count > 1)
             {
                 string tokenText = tokenMatch.Groups[1].Value;
-                return new Token(tokenText, TokenType.Personal);
+                return new Token(tokenText, TokenType.BitbucketAccess);
             }
 
             return null;