[fenix] Fixes https://github.com/mozilla-mobile/fenix/issues/4440 changed padding for account_preference (https://github.com/mozilla-mobile/fenix/pull/4830)

Changed padding to default value in @android:style/Preference.Material.Category.
Also changed paddingEnd value to default value.

app/src/main/res/layout/account_preference.xml

@@ -9,8 +9,8 @@
     android:layout_height="wrap_content"
     android:foreground="?android:attr/selectableItemBackground"
     android:gravity="center_vertical"
-    android:paddingStart="16dp"
-    android:paddingEnd="16dp">
+    android:paddingStart="?android:attr/listPreferredItemPaddingStart"
+    android:paddingEnd="?android:attr/listPreferredItemPaddingEnd">
 
     <FrameLayout
         android:id="@+id/icon_frame"