chore(ui): Use justify-start in 640px or larger (#2781l)

Author: KATO-Hiro

src/lib/components/TaskTables/TaskTable.svelte

@@ -171,7 +171,7 @@
 
 <!-- See: -->
 <!-- https://flowbite-svelte.com/docs/components/button-group -->
-<div class="flex justify-center m-4">
+<div class="flex justify-center md:justify-start m-4">
   <ButtonGroup class="flex flex-wrap justify-start gap-1 shadow-none">
     {#each Object.entries(contestTableProviderGroups) as [type, config]}
       <Button