selectrum: fix marginalia not loading on +prescient

`:after selectrum` is unnecessary anyway

modules/completion/selectrum/TODO.org

@@ -3,7 +3,6 @@
 ** TODO Add vanilla keybindings
 *** TODO Add keybinding for embark-act
 ** TODO ~+orderless~ doesn't work
-** TODO ~+prescient~ causes marginalia to not be loaded automatically.
 * PROJ List of things needed for Ivy parity
 ** TODO Icons
 https://github.com/minad/marginalia/issues/59

modules/completion/selectrum/config.el

@@ -92,7 +92,6 @@
         embark-become-indicator embark-action-indicator))
 
 (use-package! marginalia
-  :after selectrum
   :hook (doom-first-input . marginalia-mode)
   :init
   (setq-default marginalia-annotators '(marginalia-annotators-heavy)))