Update github_theme.json - minor syntax tweak scrollbar_thumb to scrolbar.thumb

Author: jasongitmail

themes/github_theme.json

@@ -47,7 +47,7 @@
         "panel.background": "#f6f8faff",
         "panel.focused_border": "#e1e4e8ff",
         "pane.focused_border": null,
-        "scrollbar_thumb.background": "#959da533",
+        "scrollbar.thumb.background": "#959da533",
         "scrollbar.thumb.hover_background": "#959da544",
         "scrollbar.thumb.border": "#eeeeeeff",
         "scrollbar.track.background": "#00000000",
@@ -421,7 +421,7 @@
         "panel.background": "#1f2428ff",
         "panel.focused_border": "#1b1f23ff",
         "pane.focused_border": null,
-        "scrollbar_thumb.background": "#6a737d33",
+        "scrollbar.thumb.background": "#6a737d33",
         "scrollbar.thumb.hover_background": "#6a737d44",
         "scrollbar.thumb.border": "#363c46ff",
         "scrollbar.track.background": "#00000000",