Add remember_position field to the Preferences and VideoPreferences structs, and add a checkbox in the preferences page to toggle it

src/invidious/config.cr

@@ -42,6 +42,7 @@ struct ConfigPreferences
   property volume : Int32 = 100
   property vr_mode : Bool = true
   property show_nick : Bool = true
+  property remember_position : Bool = false
 
   def to_tuple
     {% begin %}