correct error string, #N/A instead of #NA

is that mapping used at all?

Change-Id: I15019072b6e812b9ffe29d3ee6afacd9ab526948

sc/source/filter/oox/unitconverter.cxx

@@ -112,7 +112,7 @@ UnitConverter::UnitConverter( const WorkbookHelper& rHelper ) :
     addErrorCode( BIFF_ERR_REF,   "#REF!" );
     addErrorCode( BIFF_ERR_NAME,  "#NAME?" );
     addErrorCode( BIFF_ERR_NUM,   "#NUM!" );
-    addErrorCode( BIFF_ERR_NA,    "#NA" );
+    addErrorCode( BIFF_ERR_NA,    "#N/A" );
 }
 
 void UnitConverter::finalizeImport()