UI: Fix T77173: Report Background Colors for 2.83 Release

This is a temporary solution for T77173 for the 2.83 release. D7203
provides a more long term solution for future releases.

This adds theme colors for the three report backgrounds, setting them
to the color used in 2.82. A separate commit in the addons repository
will follow for changes to the bundled themes.

Differential Revision: https://developer.blender.org/D7908

release/scripts/presets/interface_theme/blender_light.xml

@@ -1052,6 +1052,9 @@
         info_property_text="#ffffff"
         info_operator="#3ace87ff"
         info_operator_text="#ffffff"
+        info_report_error="#990000"
+        info_report_warning="#b36a00"
+        info_report_info="#6080ff"
         >
         <space>
           <ThemeSpaceGeneric