Multires: Enable sculpting in all subdivision levels

Return the correct sculpt level in BKE_multires_sculpt_level_get and
enable the property in the UI

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D7575

source/blender/blenkernel/intern/multires.c

@@ -407,7 +407,7 @@ int multires_get_level(const Scene *scene,
                              mmd->renderlvl;
   }
   else if (ob->mode == OB_MODE_SCULPT) {
-    return BKE_multires_sculpt_level_get(mmd);
+    return mmd->sculptlvl;
   }
   else if (ignore_simplify) {
     return mmd->lvl;
@@ -2516,12 +2516,3 @@ int mdisp_rot_face_to_crn(struct MVert *UNUSED(mvert),
 
   return S;
 }
-
-/* This is a workaround for T58473.
- * Force sculpting on the highest level for until the root of the issue is solved.
- *
- * When that issue is solved simple replace call of this function with mmd->sculptlvl. */
-int BKE_multires_sculpt_level_get(const struct MultiresModifierData *mmd)
-{
-  return mmd->totlvl;
-}