relocate reset all button

resource/locales/en_US/admin/admin.json

@@ -263,7 +263,6 @@
     "selecting_bot_types": {
       "slack_bot": "Slack bot",
       "detailed_explanation": "Detailed explanation",
-      "selecting_bot_type": "・Select bot type",
       "official_bot": "Official bot",
       "custom_bot": "Custom bot",
       "without_proxy": "without proxy",

resource/locales/ja_JP/admin/admin.json

@@ -261,7 +261,6 @@
     "selecting_bot_types": {
       "slack_bot": "Slack bot",
       "detailed_explanation": "詳しい説明はこちら",
-      "selecting_bot_type": "・Botタイプを選択する",
       "official_bot": "Official bot",
       "custom_bot": "Custom bot",
       "without_proxy": "without proxy",

resource/locales/zh_CN/admin/admin.json

@@ -271,7 +271,6 @@
     "selecting_bot_types": {
       "slack_bot": "Slack bot",
       "detailed_explanation": "详细说明",
-      "selecting_bot_type": "・选择机器人类型",
       "official_bot": "Official bot",
       "custom_bot": "Custom bot",
       "without_proxy": "without proxy",

src/client/js/components/Admin/SlackIntegration/SlackIntegration.jsx

@@ -197,19 +197,13 @@ const SlackIntegration = (props) => {
           </a>
         </h2>
 
-        <div className="d-flex justify-content">
-          <div className="mr-auto">
-            {t('admin:slack_integration.selecting_bot_types.selecting_bot_type')}
-          </div>
-
-          {(currentBotType != null) && (
-            <button
-              className="mx-3 btn btn-outline-danger flex-end"
-              type="button"
-              onClick={() => setIsDeleteConfirmModalShown(true)}
-            >{t('admin:slack_integration.reset_all_settings')}
-            </button>
-          )}
+        <div className="d-flex justify-content-end">
+          <button
+            className="btn btn-outline-danger"
+            type="button"
+            onClick={() => setIsDeleteConfirmModalShown(true)}
+          >{t('admin:slack_integration.reset_all_settings')}
+          </button>
         </div>
 
         <div className="row my-5 flex-wrap-reverse justify-content-center">