UI: Reduce Light Theme Icon Border Opacity

Reduce the Light Theme Icon Border Intensity from 1.0 to 0.7 to better
match the result in Blender versions prior to SVG icons. The icon
border is now done within the text shader so the result is a bit
stronger than the old method.

Pull Request: https://projects.blender.org/blender/blender/pulls/131396

scripts/presets/interface_theme/Blender_Light.xml

@@ -29,7 +29,7 @@
         icon_modifier="#84b8ffff"
         icon_shading="#ea7581ff"
         icon_folder="#e3c16eff"
-        icon_border_intensity="1"
+        icon_border_intensity="0.7"
         >
         <wcol_regular>
           <ThemeWidgetColors