Undo/Delete Pairings about mtg-tolaria

[Slanfan]

Updated text to Delete active pairings

[Slanfan]

.match-deleted {
    position: relative;
    width: 50%;
    margin-left: auto;
    margin-right: auto;
    margin-top: 10%;
    height: auto;
    padding: 2rem;
    background: var(--content-hover-title-text);
    border-radius: .25rem;
    color: var(--content-bg);
}

<ng-container *ngIf="matchDeleted">
  <div class="match-deleted">
    <div class="h1">Match Deleted</div>
    <div class="text-large">The match is no longer available, the organizer must have deleted it. Please return to the event and look for announcements from the organizer.</div>
  </div>
</ng-container>

// new checker
matchDeleted = false;

// add check for undefined matchdoc in the subscription
this.matchDocument$.subscribe((matchDoc) => {
      if (!matchDoc) {
        this.matchDeleted = true;
        return;
      }