Rescanning field at the bottom left side is not complete #157

When rescan the progress bar can disappear or be far behind.

No progress bar:

Synced block displayed in the progress is far behind of the actual synced block. It stops displaying rescan progress after about 10 seconds and after a few minutes it disappears:

{
  "rescanning": true,
  "rescan_progress": "0.3672",
  "rescan_start_height": 3,
  "rescan_height": 606068
}

During rescan it's good to say the rescan is ongoing and display the current block:

We could completely remove the progress bar on the left and instead, during the rescan, tell what is the current synced block on the right side, also changing "Connected" to "Rescanning".

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I remember working on some stuff related to this in the past. From what I recall, the left status area is a bit tricky to work correctly. There are multiple timers for other RPCs that share updating that area. I think the timer for checking getrescaninfo gets killed by other RPCs and stops updating, but I haven't looked at that code in awhile.

It would be nice to have a working rescan progress in the GUI somewhere.