Fix #121410: Prevent diffing of Scene's tool settings.

This is a bit of a hack hammer to solve a specific issue, but it is not
really clear to my currently why some of these tool settings get
invalid data.

On the other end, not sure that it would make any sense to consider
these 'runtime' data for liboverrides anyway.

source/blender/makesrna/intern/rna_scene.cc

@@ -8876,6 +8876,7 @@ void RNA_def_scene(BlenderRNA *brna)
   /* Tool Settings */
   prop = RNA_def_property(srna, "tool_settings", PROP_POINTER, PROP_NONE);
   RNA_def_property_flag(prop, PROP_NEVER_NULL);
+  RNA_def_property_override_flag(prop, PROPOVERRIDE_NO_COMPARISON);
   RNA_def_property_pointer_sdna(prop, nullptr, "toolsettings");
   RNA_def_property_struct_type(prop, "ToolSettings");
   RNA_def_property_ui_text(prop, "Tool Settings", "");