phsl / new-api

Fix the search button loading state to be consistent with other table components.
The search button now properly shows loading animation when the table data is
being fetched.

Changes:
- Update search button loading prop from `loading={searching}` to
  `loading={loading || searching}` in TokensTable.js
- This ensures loading state is shown both when searching with keywords
  (searching=true) and when loading default data (loading=true)
- Aligns with the behavior of other table components like ChannelsTable,
  UsersTable, and RedemptionsTable

Before: Search button only showed loading when searching with keywords
After: Search button shows loading for all table data fetch operations