convert SvxNumberFormatShell::SetComment4Entry from String to OUString

I seemed to have missed this in my earlier conversion process.

Change-Id: I9266fac26425d552520ce68bdcce9b8f4cdbe9a6

include/svx/numfmtsh.hxx

@@ -159,7 +159,7 @@ public:
     short               GetCategory4Entry(short nEntry);
     bool                GetUserDefined4Entry(short nEntry);
     OUString            GetFormat4Entry(short nEntry);
-    void                SetComment4Entry(short nEntry,String aCommentString);
+    void                SetComment4Entry(short nEntry, const OUString& aCommentString);
 
     void                SetCurrencySymbol(sal_uInt16 nPos);
     sal_uInt32          GetCurrencySymbol();

svx/source/items/numfmtsh.cxx

@@ -1263,7 +1263,7 @@ void SvxNumberFormatShell::MakePrevStringFromVal(
 #*
 #************************************************************************/
 
-void SvxNumberFormatShell::SetComment4Entry(short nEntry,String aEntStr)
+void SvxNumberFormatShell::SetComment4Entry(short nEntry, const OUString& aEntStr)
 {
     SvNumberformat *pNumEntry;
     if(nEntry<0) return;