Allow playerData to be null in formattedSaveFileType

Updated the formattedSaveFileType type to permit playerData to be null, providing flexibility for cases where player data may be unavailable.

Author: JorchCortez

src/types/displayDataTypes.ts

@@ -1,6 +1,6 @@
 export type formattedSaveFileType = {
     farmName?: string;
-    playerData: fullPlayerDataType;
+    playerData: fullPlayerDataType | null;
     farmhandData: fullPlayerDataType[];
 }