Fix server banner size on Visual Refresh

[balmy lichen]

This CSS snippet fixes the Discord Server Banner gradient size, and also fixes the banner size on Visual Refresh Experiment.

/* Fix server banner gradient and size */
.visual-refresh [class^=animatedContainer_] [class^=bannerImage_] > img {

    width: calc(var(--custom-guild-sidebar-width) - 32%);
}

.visual-refresh [class^=animatedContainer_] [class^=bannerImage_]::before {
    width: calc(var(--custom-guild-sidebar-width) - 32%);
}```

Screenshots: (before/after)

[robust hawk]

cool