[MC-272761] Attribute modifiers "show_in_tooltip" no longer has any effect

After the changed attribute modifiers format, the "show_in_tooltip" value is completely ignored.

In 1.20.6, this command will make the modifiers not show in the tooltip:

/give @p feather[attribute_modifiers={modifiers:[{name:"test",uuid:[I;0,0,0,0],type:"generic.gravity",amount:-2,operation:add_multiplied_base}],show_in_tooltip:0b}]

But in 1.21-pre1, the tooltip always shows the modifiers, even when "show_in_tooltip" is set to false

/give @p feather[attribute_modifiers={modifiers:[{id:"test",type:"generic.gravity",amount:-2,operation:add_multiplied_base}],show_in_tooltip:0b}]