Fix - correctly use fGridColor from TStyle

Author: linev

changes.md

@@ -4,6 +4,7 @@
 1. Fix in marker attributes handling - can mix different attributes 
 2. Fix in unzomming of log scale - https://root-forum.cern.ch/t/25889
 3. Fix in TMultiGraph painting - ignore not-supported options https://root-forum.cern.ch/t/25888
+4. Fix - correctly use fGridColor from TStyle 
 
 
 ## Changes in 5.2.2

scripts/JSRootPainter.js

@@ -7008,8 +7008,8 @@
       var pad = this.root_pad(), h = this.frame_height(), w = this.frame_width(),
           grid, grid_style = JSROOT.gStyle.fGridStyle, grid_color = "black";
 
-      if (JSROOT.Painter.fGridColor > 0)
-         grid_color = JSROOT.Painter.root_colors[JSROOT.Painter.fGridColor];
+      if (JSROOT.gStyle.fGridColor > 0)
+         grid_color = JSROOT.Painter.root_colors[JSROOT.gStyle.fGridColor];
 
       if ((grid_style < 0) || (grid_style >= JSROOT.Painter.root_line_styles.length)) grid_style = 11;