tdf#119531: use correct conversion direction

Regression from commit 8c48d69f

Change-Id: I302a210ab6c502e3938487ee02a08fc334cd3289
Reviewed-on: https://gerrit.libreoffice.org/59666
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

svx/source/sidebar/possize/SidebarDialControl.cxx

@@ -56,7 +56,7 @@ void SidebarDialControl::HandleMouseEvent( const Point& rPos, bool bInitial )
     if( fH != 0.0 )
     {
         double fAngle = acos( nX / fH );
-        sal_Int32 nAngle = static_cast<sal_Int32>(basegfx::deg2rad(fAngle) * 100.0);
+        sal_Int32 nAngle = static_cast<sal_Int32>(basegfx::rad2deg(fAngle) * 100.0);
         if( nY < 0 )
             nAngle = 36000 - nAngle;
         if( bInitial )  // round to entire 15 degrees