added loadSection to init()

[jamesros161]

This resolves #156 by ensuring that loadSection() runs every time 'boldgrid_customizer_refresh' event fires.

[rramo012]

1. Load section is supposed to be run once when the customizer loads. It shouldn't be run each time a preview refresh is triggered by a control. Moving the function call into init will bind the expanded event repeatedly. This causes duplicate function calls on a single event; one binding for every refresh triggered by a control.

2. The fix you implemented did not resolve the issue for me. You can replicate by...

   • set the background image
   • Reloading the customizer
   • Insert a widget
   • open the background panel

3. By removing the previous fix, this issue breaks: Crio - Uploading an Image Background flips Customizer to Pattern & Color panel  #140

4. Most likely unrelated to this ticket but can you verify that background patterns are working? If not, can you create a new ticket for it?

My recommendation would be reverting to the previous code. Then add the following to the background_image expanded callback. This should handle the refresh cases when the panel is focused immediately, and when the panel is not focused the update would be done upon opening the background image panel.

api.section( 'background_image' ).expanded.bind( expanded => {
    if ( expanded ) {
        updateBgType( api( 'boldgrid_background_type' )() );
        validateSelectionSet();
    }

[rramo012]

Needs changes