Revert "Modifications to deltachat, vol. 2"

This reverts commit 0178de0151543e8c4e50045378034e8adb7d4c88.

bucket/deltachat.json

@@ -19,7 +19,8 @@
     ],
     "persist": [
         [
-            "DeltaChatData"
+            "DeltaChatData",
+            "data"
         ]
     ],
     "checkver": "github",