Fix backport

Author: sbrunner

src/server/qgsfcgiserverrequest.cpp

@@ -111,7 +111,7 @@ QgsFcgiServerRequest::QgsFcgiServerRequest()
   for ( const auto &headerKey : qgsEnumMap<QgsServerRequest::RequestHeader>().values() )
   {
     const QString headerName = QgsStringUtils::capitalize(
-                                 QString( headerKey ).replace( QLatin1Char( '_' ), QLatin1Char( ' ' ) ), Qgis::Capitalization::TitleCase
+                                 QString( headerKey ).replace( QLatin1Char( '_' ), QLatin1Char( ' ' ) ), QgsStringUtils::Capitalization::TitleCase
                                ).replace( QLatin1Char( ' ' ), QLatin1Char( '-' ) );
     const char *result = getenv( QStringLiteral( "HTTP_%1" ).arg( headerKey ).toStdString().c_str() );
     if ( result && strlen( result ) > 0 )

src/server/qgsserverrequest.cpp

@@ -63,7 +63,7 @@ QString QgsServerRequest::header( const QgsServerRequest::RequestHeader &headerE
 {
   const QString headerKey = QString( qgsEnumValueToKey<QgsServerRequest::RequestHeader>( headerEnum ) );
   const QString headerName = QgsStringUtils::capitalize(
-                               QString( headerKey ).replace( QLatin1Char( '_' ), QLatin1Char( ' ' ) ), Qgis::Capitalization::TitleCase
+                               QString( headerKey ).replace( QLatin1Char( '_' ), QLatin1Char( ' ' ) ), QgsStringUtils::Capitalization::TitleCase
                              ).replace( QLatin1Char( ' ' ), QLatin1Char( '-' ) );
   return header( headerName );
 }