Fix odd numbered row bg color in striped table

app/assets/stylesheets/framework/variables.scss

@@ -834,3 +834,4 @@ $font-family-sans-serif: $regular_font;
 $font-family-monospace: $monospace_font;
 $input-line-height: 20px;
 $btn-line-height: 20px;
+$table-accent-bg: $gray-light;