[auth] Fix return value for plugins that do not support an expansion

Bug not evident until there were providers with multiple credential
expansions (now supported in OWS providers). Lack of support for an
expansion should only trigger a debug message, not a failure.

(cherry-picked from 194b5ad)

src/core/auth/qgsauthmanager.cpp

@@ -1365,8 +1365,8 @@ bool QgsAuthManager::updateNetworkRequest( QNetworkRequest &request, const QStri
   {
     if ( !( authmethod->supportedExpansions() & QgsAuthMethod::NetworkRequest ) )
     {
-      QgsDebugMsg( QString( "Data source URI updating not supported by authcfg: %1" ).arg( authcfg ) );
-      return false;
+      QgsDebugMsg( QString( "Network request updating not supported by authcfg: %1" ).arg( authcfg ) );
+      return true;
     }
 
     if ( !authmethod->updateNetworkRequest( request, authcfg, dataprovider.toLower() ) )
@@ -1392,7 +1392,7 @@ bool QgsAuthManager::updateNetworkReply( QNetworkReply *reply, const QString& au
     if ( !( authmethod->supportedExpansions() & QgsAuthMethod::NetworkReply ) )
     {
       QgsDebugMsg( QString( "Network reply updating not supported by authcfg: %1" ).arg( authcfg ) );
-      return false;
+      return true;
     }
 
     if ( !authmethod->updateNetworkReply( reply, authcfg, dataprovider.toLower() ) )
@@ -1418,7 +1418,7 @@ bool QgsAuthManager::updateDataSourceUriItems( QStringList &connectionItems, con
     if ( !( authmethod->supportedExpansions() & QgsAuthMethod::DataSourceURI ) )
     {
       QgsDebugMsg( QString( "Data source URI updating not supported by authcfg: %1" ).arg( authcfg ) );
-      return false;
+      return true;
     }
 
     if ( !authmethod->updateDataSourceUriItems( connectionItems, authcfg, dataprovider.toLower() ) )