Revert router base name for Uptime plugin to use hash in default path. (#50095)

Author: justinkambic

x-pack/legacy/plugins/uptime/common/constants/plugin.ts

@@ -7,6 +7,6 @@
 export const PLUGIN = {
   APP_ROOT_ID: 'react-uptime-root',
   ID: 'uptime',
-  ROUTER_BASE_NAME: '/app/uptime',
+  ROUTER_BASE_NAME: '/app/uptime#',
   LOCAL_STORAGE_KEY: 'xpack.uptime',
 };