Added filterfunctions

src/components/runners/RunnersOverview.svelte

@@ -18,18 +18,22 @@
     {
       accessorKey: "firstname",
       header: () => "firstname",
+      filterFn: `includesString`
     },
     {
       accessorKey: "lastname",
       header: () => "lastname",
+      filterFn: `includesString`
     },
     {
       accessorKey: "group.name",
       header: () => "group",
+      filterFn: `includesString`
     },
     {
       accessorKey: "distance",
       header: () => "distance",
+      filterFn: `equals`
     },
   ];