Enable toggling subset of users in when2meet results view

when2meet-subset.js

// paste this into your browser console when looking at when2meet results
if (!window.OrigAvailableAtSlot) window.OrigAvailableAtSlot = AvailableAtSlot;
if (!window.OrigAvailableIDs) window.OrigAvailableIDs = AvailableIDs;
let nameFilter;
if (nameFilter = document.getElementById('NameFilter')) nameFilter.remove();
nameFilter = document.createElement('ul');
nameFilter.id = 'NameFilter';
document.getElementById('LeftPanel').appendChild(nameFilter);
const idOn = (id) => document.getElementById(id).checked;
for (let i = 0; i < PeopleNames.length; i++) {
  const li = document.createElement('li');
  li.innerHTML = `<input type="checkbox" id="${PeopleIDs[i]}" checked>` +
    `&nbsp;<label for="${PeopleIDs[i]}">${PeopleNames[i]}</label>`;
  nameFilter.appendChild(li);
  li.addEventListener('change', () => {
    AvailableIDs = OrigAvailableIDs.filter(idOn);
    AvailableAtSlot = OrigAvailableAtSlot.map((avail) => avail.filter(idOn));
    ReColorGroup();
  });
}