cleanup jobs and Params relicts

- the `jobs` table is no longer in use,
  no need to track files on housekeeping,
  no need to clear it from repl tool

- some `Params` were used for jobs table only,
  they can be used freely for other purposes on other tables.
  param 'protection settings timestamp' was never used in practise,
  its code is removed as well, so we can free the Param as well.

deltachat-repl/src/cmdline.rs

@@ -33,14 +33,6 @@ use tokio::fs;
 /// e.g. bitmask 7 triggers actions defined with bits 1, 2 and 4.
 async fn reset_tables(context: &Context, bits: i32) {
     println!("Resetting tables ({bits})...");
-    if 0 != bits & 1 {
-        context
-            .sql()
-            .execute("DELETE FROM jobs;", ())
-            .await
-            .unwrap();
-        println!("(1) Jobs reset.");
-    }
     if 0 != bits & 2 {
         context
             .sql()