[bugfix] Fixes WFS HTTP auth basic username/password

Fixes #15360 and #15597

src/core/qgsdatasourceuri.cpp

@@ -153,7 +153,7 @@ QgsDataSourceURI::QgsDataSourceURI( QString uri )
       {
         mAuthConfigId = pval;
       }
-      else if ( pname == "user" )
+      else if ( pname == "user" || pname == "username" ) // Also accepts username as used in new WFS provider
       {
         mUsername = pval;
       }