drop legacy ThFilter components

src/components/runners/ThFilterGroup.svelte

@@ -1,35 +0,0 @@
-<script>
-  import { _ } from "svelte-i18n";
-  export let groups;
-  export let handler;
-  let selected = "all";
-</script>
-
-<th style="border-bottom: 1px solid #ddd;">
-  <select
-    on:input={() => {
-      setTimeout(() => {
-        if (`${selected}`.trim()) {
-          const value = selected;
-          handler.filter(value, (runner) => {
-            if (
-              runner.group.id === value ||
-              runner?.group?.parentGroup?.id === value ||
-              value === "all"
-            )
-              return runner;
-            return "";
-          });
-        }
-      }, 50);
-    }}
-    bind:value={selected}
-    name="groupfilter"
-    id="groupfilter"
-  >
-    <option value="all">{$_('all')}</option>
-    {#each groups as g}
-      <option value={g.value}>{g.label}</option>
-    {/each}
-  </select>
-</th>