Decrease visible records per page

After months of usage, I rarely paginate the list, so it's not necessary
to load 100 at a time. 20 is enough.

By matching 20 records with a 20 pool size, we should keep the repo
queue time to a minimum.

lib/music_library_web/live/collection_live/index.ex

@@ -10,7 +10,7 @@ defmodule MusicLibraryWeb.CollectionLive.Index do
   @default_records_list_params %{
     query: "",
     page: 1,
-    page_size: 100
+    page_size: 20
   }
 
   @impl true

lib/music_library_web/live/wishlist_live/index.ex

@@ -10,7 +10,7 @@ defmodule MusicLibraryWeb.WishlistLive.Index do
   @default_records_list_params %{
     query: "",
     page: 1,
-    page_size: 100
+    page_size: 20
   }
 
   @impl true