Reduce padding in color picker popover

packages/grafana-ui/src/components/ColorPicker/_ColorPicker.scss

@@ -129,7 +129,7 @@ $arrowSize: 15px;
 
 .ColorPickerPopover__content {
   width: 360px;
-  padding: 32px;
+  padding: 24px;
 }
 
 .ColorPickerPopover__tabs {