Sketcher: Rename Sketcher_BSplineApproximate.svg

For consistency: rename the icon to match the command name.

src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp

@@ -116,7 +116,7 @@ CmdSketcherConvertToNURBS::CmdSketcherConvertToNURBS()
     sToolTipText = QT_TR_NOOP("Converts the selected geometry to a B-spline");
     sWhatsThis = "Sketcher_BSplineConvertToNURBS";
     sStatusTip = sToolTipText;
-    sPixmap = "Sketcher_BSplineApproximate";
+    sPixmap = "Sketcher_BSplineConvertToNURBS";
     sAccel = "";
     eType = ForEdit;
 }

src/Mod/Sketcher/Gui/Resources/Sketcher.qrc

@@ -270,7 +270,7 @@
         <file>icons/pointers/Sketcher_Pointer_Trimming.svg</file>
     </qresource>
     <qresource>
-        <file>icons/splines/Sketcher_BSplineApproximate.svg</file>
+        <file>icons/splines/Sketcher_BSplineConvertToNURBS.svg</file>
         <file>icons/splines/Sketcher_BSplineDecreaseDegree.svg</file>
         <file>icons/splines/Sketcher_BSplineDecreaseKnotMultiplicity.svg</file>
         <file>icons/splines/Sketcher_BSplineIncreaseDegree.svg</file>