Remove custom faces from module

Removed the custom faces from the module in favor of setting them in
doom-themes itself
https://github.com/hlissner/emacs-doom-themes/pull/467

modules/ui/minimap/config.el

@@ -6,9 +6,4 @@
   (setq minimap-window-location 'right
         minimap-update-delay 0
         minimap-width-fraction 0.09
-        minimap-minimum-width 15)
-  (custom-set-faces!
-    `(minimap-current-line-face
-      :background ,(doom-color 'selection))
-    `(minimap-active-region-background
-      :background ,(doom-color 'vertical-bar))))
+        minimap-minimum-width 15))