specctra_export.cpp: Fix a conversion error from mils to mm I made i n may...

specctra_export.cpp: Fix a conversion error from mils to mm I made i n may last commit, which set min dist to find a segment end for internal outlines holes to 1 mil instead of 10 mils.

pcbnew/specctra_export.cpp

@@ -1119,7 +1119,7 @@ void SPECCTRA_DB::fillBOUNDARY( BOARD* aBoard, BOUNDARY* boundary ) throw( IO_ER
 
         // Output the interior Edge.Cuts graphics as keepouts, using nearness metric
         // for sloppy graphical items.
-        prox = Millimeter2iu( 0.025 );
+        prox = Millimeter2iu( 0.25 );
 
         while( items.GetCount() )
         {