Edit Mesh: tweak active face edge width

This rewinds a change from own commit e3d88b021c
The only took edge overlay into account (crease, seam.. etc)
Currently active-face also uses this width.

While the difference is subtle,
this makes the active-face stand out more clearly.

source/blender/draw/modes/shaders/edit_mesh_overlay_frag.glsl

@@ -29,7 +29,7 @@ out vec4 FragColor;
 /* Vertex flag is shifted and combined with the edge flag */
 #define FACE_ACTIVE     (1 << (2 + 8))
 
-#define LARGE_EDGE_SIZE 2.0
+#define LARGE_EDGE_SIZE 3.0
 
 /* Style Parameters in pixel */