fix scale widget and dxf export

Author: 3nids

src/app/qgsdxfexportdialog.cpp

@@ -438,7 +438,7 @@ QList< QPair<QgsVectorLayer *, int> > QgsDxfExportDialog::layers() const
 
 double QgsDxfExportDialog::symbologyScale() const
 {
-  double scale = mScaleWidget->scale();
+  double scale = 1/mScaleWidget->scale();
   if ( qgsDoubleNear( scale, 0.0 ) )
   {
     return 1.0;

src/gui/qgsscalewidget.cpp

@@ -62,7 +62,7 @@ void QgsScaleWidget::setScaleFromCanvas()
   if ( !mCanvas )
     return;
 
-  setScale( mCanvas->scale() );
+  setScale( 1/mCanvas->scale() );
 }