Revert "Overlay: Wireframe: avoid using custom depth bias with xray enabled"

This reverts commit 14500953ed.

The commit has introduced multiple drawing regressions in xray mode and
was already reverted in 4.1. A different solution has to be found or
the current one should make sure these regressions are fixed.

Finding the correct solution isn't priority.

* #120208
* #119527

Pull Request: https://projects.blender.org/blender/blender/pulls/120285

source/blender/draw/engines/overlay/overlay_wireframe.cc

@@ -67,8 +67,7 @@ void OVERLAY_wireframe_cache_init(OVERLAY_Data *vedata)
 
   const bool use_select = (DRW_state_is_select() || DRW_state_is_depth());
   GPUShader *wires_sh = use_select ? OVERLAY_shader_wireframe_select() :
-                                     OVERLAY_shader_wireframe(pd->antialiasing.enabled &&
-                                                              !pd->xray_enabled);
+                                     OVERLAY_shader_wireframe(pd->antialiasing.enabled);
 
   for (int xray = 0; xray < (is_material_shmode ? 1 : 2); xray++) {
     DRWState state = DRW_STATE_FIRST_VERTEX_CONVENTION | DRW_STATE_WRITE_COLOR |