tdf#112817 Fix the sidebar underline dropdown

Regression of commit 03041e0f
("tdf#112817 editeng,svx: fix SvxUnderlineItem/SvxOverlineItem SDI")

Change-Id: I68a19a47c5e9511b5d8ce0d6c312c814490bc044

svx/source/sidebar/text/TextUnderlinePopup.cxx

@@ -23,7 +23,7 @@
 
 using namespace svx;
 
-SFX_IMPL_TOOLBOX_CONTROL(TextUnderlinePopup, SvxTextLineItem);
+SFX_IMPL_TOOLBOX_CONTROL(TextUnderlinePopup, SvxUnderlineItem);
 
 TextUnderlinePopup::TextUnderlinePopup(sal_uInt16 nSlotId, sal_uInt16 nId, ToolBox& rTbx)
     : SfxToolBoxControl(nSlotId, nId, rTbx)