Fix map history arbitrary lookup

There was a bug that meant the get_date function didn't work for non-i-frames. Fixed that, so we can now properly lookup any date in the game's timespan

src/lib.rs

@@ -219,11 +219,10 @@ pub async fn do_webgl(history: &str, base_url: &str) -> Result<JsValue, JsValue>
                 let Ok(date) = date.parse::<EU4Date>() else {
                     return Err(JsError::new("Invalid date.").into());
                 };
-
-                current_date = date;
                 let Some(frame) = history.get_date(&date) else {
                     return Err(JsError::new("Unable to resolve the map state at this date. It may be outside the game's timespan.").into());
                 };
+                current_date = date;
 
                 current_frame = frame;
                 log!("{current_date}");

src/map_history.rs

@@ -298,7 +298,7 @@ impl ColorMapManager {
         }
 
         let (mut iter_date, mut i_frame) =
-            EU4Date::iter_range_inclusive_reversed(*date, date.with_year(date.year - 1))
+            EU4Date::iter_range_inclusive_reversed(date.with_year(date.year - 1), *date)
                 .find_map(|d| Some((d, self.i_frames.get(&d)?.clone())))?;
         while iter_date < *date {
             self.apply_diffs(&iter_date, &mut i_frame);