Fix another warning

Author: nyalldawson

src/core/mesh/qgsmeshvectorrenderer.cpp

@@ -53,7 +53,7 @@ QgsMeshVectorRenderer::QgsMeshVectorRenderer( const QgsTriangularMesh &m,
     double datasetMagMaximumValue,
     bool dataIsOnVertices,
     const QgsMeshRendererVectorSettings &settings,
-    QgsRenderContext &context, const QSize &size )
+    QgsRenderContext &context, QSize size )
   : mTriangularMesh( m )
   , mDatasetValuesX( datasetValuesX )
   , mDatasetValuesY( datasetValuesY )

src/core/mesh/qgsmeshvectorrenderer.h

@@ -54,7 +54,7 @@ class QgsMeshVectorRenderer
                            bool dataIsOnVertices,
                            const QgsMeshRendererVectorSettings &settings,
                            QgsRenderContext &context,
-                           const QSize &size );
+                           QSize size );
     //! Dtor
     ~QgsMeshVectorRenderer();