Set default seven days to sync for user folders

Sync of user folders is disabled by default

app/src/main/java/eu/faircode/email/EntityFolder.java

@@ -67,7 +67,7 @@ public class EntityFolder {
             TYPE_TRASH,
             TYPE_JUNK,
             TYPE_SENT
-    ); // Must match SYSTEM_FOLDER_ATTR
+    ); // MUST match SYSTEM_FOLDER_ATTR
 
     static final List<String> FOLDER_SORT_ORDER = Arrays.asList(
             TYPE_INBOX,
@@ -80,8 +80,9 @@ public class EntityFolder {
             TYPE_USER
     );
 
-    static final int DEFAULT_INBOX_SYNC = 30;
-    static final int DEFAULT_STANDARD_SYNC = 7;
+    static final int DEFAULT_INBOX_SYNC = 30; // days
+    static final int DEFAULT_SYSTEM_SYNC = 7; // days
+    static final int DEFAULT_USER_SYNC = 7; // days
 
     static final List<String> SYSTEM_FOLDER_SYNC = Arrays.asList(
             TYPE_ARCHIVE,

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -296,7 +296,7 @@ public class FragmentAccount extends FragmentEx {
                                 folder.name = ifolder.getFullName();
                                 folder.type = type;
                                 folder.synchronize = EntityFolder.SYSTEM_FOLDER_SYNC.contains(folder.type);
-                                folder.after = EntityFolder.DEFAULT_STANDARD_SYNC;
+                                folder.after = EntityFolder.DEFAULT_SYSTEM_SYNC;
                                 folders.add(folder);
 
                                 Log.i(Helper.TAG, account.name +

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -944,7 +944,7 @@ public class ServiceSynchronize extends LifecycleService {
                         folder.name = ifolder.getFullName();
                         folder.type = EntityFolder.TYPE_USER;
                         folder.synchronize = false;
-                        folder.after = 0;
+                        folder.after = EntityFolder.DEFAULT_USER_SYNC;
                         dao.insertFolder(folder);
                         Log.i(Helper.TAG, folder.name + " added");
                     } else