Increase visibility of selected sample trace

[brwnj]

This is more apparent when you increase sample size:

Reducing to 10% opacity helps while still preserving an aspect of background:

function highlight_sample(sample) {
    setHashParams({'sample': sample})
    let d = document.getElementById("gene_plot")
    let vals = d.data.map((t, i) => {
        if (t.tracktype == "background") {
            return [1, 1.5]
        }
        if (t.tracktype != 'sample') {
            return [undefined, undefined]
        } else {
            if (t.name == sample) {
                return [1, 2]
            } else {
                return [0.10, 0.36]
            }
        }
    })

    Plotly.restyle(d, {'opacity': vals.map(i => i[0]), 'line.width': vals.map(i => i[1]), 'hovertemplate': vals.map(i => i[1] > 0.8 ? HOVER_TEMPLATE: null)})
}

Open to community suggestions for fixing cases like NEB.