[LVGL] Support for "Knob recolor" option in Colorwheel widget

[jackmiaomiao]

Original description of the issue:

colorwheel组件在创建时knob_recolor默认为false：lv_colorwheel_create(parent_obj, false);没有地方可以修改为true

Currently, Colorwheel widget is constructed by calling:

lv_colorwheel_create(parent, false);

This second argument is:

"knob_recolor true: set the knob's color to the current color."

Add a property "Knob recolor" so we can change the value of "knob_recolor" argument to true.