feat: add option to hide label when battery is full

[rubiin]

closes #313

Adds an option to toggle the battery label on bar when the charge is full

[Jas-SinghFSU]

👀 On a roll lol.

[Jas-SinghFSU]

Similarly, if the label is hidden, the split style icon needs to have it border adjusted. We can add the last-child scope at the bottom of this css.

    .bar-button-icon.battery {
        border-top-left-radius: $bar-buttons-radius;
        border-bottom-left-radius: $bar-buttons-radius;
        background: if($bar-buttons-monochrome, $bar-buttons-icon, $bar-buttons-battery-icon_background);
        padding: $bar-buttons-padding_y 0em;
        padding-left: $bar-buttons-padding_x;
        padding-right: $bar-buttons-battery-spacing;
        border-top-left-radius: if(
            $bar-buttons-battery-enableBorder or $bar-buttons-enableBorders,
            $bar-buttons-radius * 0.4,
            $bar-buttons-radius
        );
        border-bottom-left-radius: if(
            $bar-buttons-battery-enableBorder or $bar-buttons-enableBorders,
            $bar-buttons-radius * 0.4,
            $bar-buttons-radius
        );

        &:last-child {
            border-radius: $bar-buttons-radius;
        }
    }

[rubiin]

👀 On a roll lol.