Removed any zero probability tokens from hover pop-up

[jukofyork]

Fixes #84

This just removes any that are zero, but could also remove any that round down to 0.00% like this:

${probs ? html`
    <div
        id="probs"
        style=${{
            'display': 'none'
        }}>
        ${probs.map((prob, i) => {
            const probPercentage = (prob.prob * 100).toFixed(2);
            if (probPercentage === '0.00') return null;

            const index = currentPromptChunk?.index;
            const isCurrentToken = promptChunks[index]?.prob == prob.prob;
            return html`<button key=${i} className=${isCurrentToken ? 'current' : ''} onClick=${() => switchCompletion(index, prob)}>
                <div className="tok">${replaceUnprintableBytes(prob.tok_str)}</div>
                <div className="prob">${probPercentage}%</div>
            </button>`;
        }).filter(Boolean)}
    </div>` : null}

but if the samplers are set up to select an (extremely unlikely!) sub top-10 0.00005 probability token; it will look odd that the selected token isn't in the popup IMO... So decided against this.

[lmg-anon]

Yes, that makes sense. Thank you for your contribution.