Fix T64791: light sun angle not saved

There is a deeper problem here with DNA_struct_elem_find and Lamp/Light name
aliasing, to be fixed separately.

source/blender/blenloader/intern/versioning_280.c

@@ -3437,8 +3437,7 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *bmain)
     }
   }
 
-  {
-    /* Versioning code until next subversion bump goes here. */
+  if (!MAIN_VERSION_ATLEAST(bmain, 280, 69)) {
     LISTBASE_FOREACH (bArmature *, arm, &bmain->armatures) {
       arm->flag &= ~(ARM_FLAG_UNUSED_7 | ARM_FLAG_UNUSED_9);
     }
@@ -3450,4 +3449,8 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *bmain)
       }
     }
   }
+
+  {
+    /* Versioning code until next subversion bump goes here. */
+  }
 }