UIList Filter Materials (remove stroke)

I can not find a way to remove this Stroke materials from UIList

my code so far:
you can find panel in “properties” / “active tool”

import bpy

class Material_List(bpy.types.UIList):
    bl_idname = "TOOL_UL_MATERIAL"

    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
        row = layout.row()
        row.prop(item, "name", text="", emboss=False, icon_value=icon)

class Material_Panel(bpy.types.Panel):
    bl_idname = "TOOL_PT_MATERIAL"
    bl_label = "Material List"
    bl_space_type = "VIEW_3D"
    bl_region_type = "UI"
    bl_category = "Tool"

    def draw(self, context):
        scene = context.scene
        layout = self.layout
                    
        layout.template_list(
            "TOOL_UL_MATERIAL", "",
            bpy.data, "materials",
            scene, "set_material_id",
            rows = len(bpy.data.materials)
        )

def register():
    bpy.utils.register_class(Material_List)
    bpy.utils.register_class(Material_Panel)

def unregister():
    bpy.utils.unregister_class(Material_List)
    bpy.utils.unregister_class(Material_Panel)

if __name__ == "__main__":
    register()