Addjust stressGraphics_web.ref for TPie

Now it uses native JSROOT rendering, which is smaller compare with ROOT way of drawing

Author: linev

test/stressGraphics_web.ref

@@ -5,7 +5,7 @@ Test#   SVG1Ref#  SVG1Err#  PDFRef#   PDFErr#   JPGRef#   JPGErr#   PNGRef#   PN
     4      1792        50      6059        50     55000     20000     40240     20000      1792        50
     5     49000       300     93647       842    304049     30830    140000     65000     49000       300
     6      1768        50     10343        50     65000     20000     40977     20000      1768        50
-    7    137000      1000    172149       300    100000     40000     98889     30000    136500      1000
+    7     13043       300     23769       300    100000     40000     98889     30000     13077       300
     8      2338        50      4816        50    104754     39759     62489     21274      2338        50
     9       577        50      3642        50     16539      6033     13079      6000       577        50
    10      6585        50     10186        50     37509      9184     34969      7388      6585        50