UI: Blender theme colors matching the default theme for the face orientation front

Face Orientation Front Color has been changed to transparent for the
default theme (8bcb714b9e). This PR makes the Blender Light theme for
the face orientation front match the default theme alpha.

Pull Request: https://projects.blender.org/blender/blender/pulls/136034

scripts/presets/interface_theme/Blender_Light.xml

@@ -388,7 +388,7 @@
         freestyle_face_mark="#7fff7f33"
         face_retopology="#50c8ff1e"
         face_back="#ff0000b3"
-        face_front="#0000ffb3"
+        face_front="#0000ff00"
         nurb_uline="#909000"
         nurb_vline="#803060"
         nurb_sel_uline="#f0ff40"