Preserve Checkpoint saves across clean install backup/restore.

Back up and restore sd:/switch/Checkpoint with CyberFoil and DBI settings during clean installs.

source/backup.c

@@ -68,6 +68,14 @@ int backup_user_data(void) {
             }
         }
     }
+
+    // Backup Checkpoint (saves and app data) if installed
+    if (path_exists(CHECKPOINT_DIR)) {
+        res = folder_copy(CHECKPOINT_DIR, TEMP_BACKUP_PATH);
+        if (res != FR_OK) {
+            return res;
+        }
+    }
     
     return FR_OK;
 }
@@ -130,6 +138,14 @@ int restore_user_data(void) {
             }
         }
     }
+
+    // Restore Checkpoint if backed up
+    if (path_exists(TEMP_BACKUP_CHECKPOINT)) {
+        res = folder_copy(TEMP_BACKUP_CHECKPOINT, "sd:/switch");
+        if (res != FR_OK) {
+            return res;
+        }
+    }
     
     return FR_OK;
 }