List item inline style fix

[rinkalpagdar]

Fixes #68727

What?

This PR resolves conflict with the default style added for content

Why?

When we register style via register_block_style for list-item it gets conflicted with the default style mentioned in content.scss
We can either remove the default style or reduce the priority or else we can provide !important to our inline style. So it will have more preference.

How?

I have removed the default style causing conflicts.

Testing Instructions

1. Add an inline or inline-block pseudo ::after element via CSS to a core/list-item.

\register_block_style( 
    'core/list-item' , 
    array(
        'default'      => false,
        'name'         => 'acme-list',
        'lable'         => 'ACME List',
        'inline_style' => '.is-style-acme-list { position: relative; } .is-style-acme-list::after { content: "This is a fancy orange box."; background-color: #ffba10; } '
    )
);

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Co-authored-by: rinkalpagdar <[email protected]>
Co-authored-by: Mamaduka <[email protected]>
Co-authored-by: djcowan <[email protected]>

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[Mamaduka]

@rinkalpagdar, it looks like @singhakanshu00 is already working on the solution - #68731.

[rinkalpagdar]

@rinkalpagdar, it looks like @singhakanshu00 is already working on the solution - #68731.

@Mamaduka When I started working on the issue. I noticed that no PR or comment were submitted.