Added mutation hint upgrade.

Scripts/Garden/Save.js

@@ -68,7 +68,8 @@ function CreateNewSave() {
         Upgrades: {
             PlotSize: 0,
             PlantInformation: false,
-            GardenOverview: false
+            GardenOverview: false,
+            MutationHints: false
         },
 
         Preferences: {
@@ -260,6 +261,10 @@ function NormalizeSaveData(
         SaveData.Upgrades.GardenOverview ===
         true;
 
+    SaveData.Upgrades.MutationHints =
+        SaveData.Upgrades.MutationHints ===
+        true;
+
 
     SaveData.Preferences ??= {};