tdf#119321: fix appendCopy in searchAndReplace (printing)

Regression from:
https://cgit.freedesktop.org/libreoffice/core/commit/?id=cd66852f6dd08631a25d15a1527a647e69ab8ce3

Change-Id: Iea4b21647dd01406271f9b3e13fea3cc73e1c801
Reviewed-on: https://gerrit.libreoffice.org/59303
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

vcl/source/window/printdlg.cxx

@@ -1343,7 +1343,7 @@ static OUString searchAndReplace( const OUString& i_rOrig, const char* i_pRepl,
     if( nPos != -1 )
     {
         OUStringBuffer aBuf( i_rOrig.getLength() );
-        aBuf.appendCopy( i_rOrig, nPos );
+        aBuf.appendCopy( i_rOrig, 0, nPos );
         aBuf.append( i_rRepl );
         if( nPos + i_nReplLen < i_rOrig.getLength() )
             aBuf.appendCopy( i_rOrig, nPos + i_nReplLen );