Hopefully fix Windows build: Use proper header

numfunc::GetDefBulletFontname() returns an OUString, but there was a
declaration in frmpaint.cxx that claimed it returned a String. I have no idea
why the numrule.hxx header, which declares it correctly, was not used.

Change-Id: Id57fd738a29de3adda054be4b60f809231c016ea

sw/source/core/text/frmpaint.cxx

@@ -44,6 +44,7 @@
 #include <redlnitr.hxx> // SwRedlineItr
 #include <swmodule.hxx> // SW_MOD
 #include <tabfrm.hxx>   // SwTabFrm (Redlining)
+#include <numrule.hxx>
 #include <SwGrammarMarkUp.hxx>
 
 // #i12836# enhanced pdf export
@@ -52,15 +53,6 @@
 #include <IDocumentStylePoolAccess.hxx>
 #include <IDocumentLineNumberAccess.hxx>
 
-// variable moved to class <numfunc:GetDefBulletConfig>
-//extern const sal_Char sBulletFntName[];
-namespace numfunc
-{
-    extern const String& GetDefBulletFontname();
-    extern bool IsDefBulletFontUserDefined();
-}
-
-
 #define REDLINE_DISTANCE 567/4
 #define REDLINE_MINDIST  567/10