DSM: remove Guest login hack

SharedSources/ServerBrowsing/SMB/VLCLocalNetworkServiceBrowserDSM.m

@@ -73,14 +73,8 @@ NSString *const VLCNetworkServerProtocolIdentifierSMB = @"smb";
 }
 
 
-+ (instancetype)SMBNetworkServerBrowserWithURL:(NSURL *)url username:(NSString *)username password:(NSString *)password workgroup:(NSString *)workgroup {
-
-    BOOL guestLogin = username.length == 0 && password.length == 0;
-    if (guestLogin) {
-        username = @"Guest";
-        password = @"";
-    }
-
++ (instancetype)SMBNetworkServerBrowserWithURL:(NSURL *)url username:(NSString *)username password:(NSString *)password workgroup:(NSString *)workgroup
+{
 	VLCMedia *media = [VLCMedia mediaWithURL:url];
 	NSDictionary *mediaOptions = @{@"smb-user" : username ?: @"",
 								   @"smb-pwd" : password ?: @"",