update progressCell for bolus display

[marionbarker]

Purpose:

This PR fixes an intermittent bolus progress display error reported in these issues

• Auto bolus is giving a different amount than it shows in the UI #2196
• Total amount of bolus being delivered is incorrect in HUD #2195
• [Dev] UI glitch for X of Y Bolus delivered #2109

@itsmojo identified root cause for this intermittent display error and passed on a proposed fix for the main branch which is found in PR 2264.

If a bolus progress is being displayed when the app is put into background and then the app is opened in the middle of a bolus, the progress bar shows a stale value of the expected total units; the stale value is the total units from the last time the bolus progress bar was displayed.

This PR is one of 3. One each to main (closed without merging), tidepool-merge (PR #2263) and dev (this one).

I was incorrect in this next statement.
They all have the same fix which has been tested extensively.

The code change for tidepool-merge is different from that needed for main and dev and I mistakenly copied the tidepool-merge changes over. See #2298 for the correction needed for the dev branch.

[ps2]

LGTM!

[marionbarker]

Apologies - I rushed this through without testing properly.

The original patch that @itsmojo gave me, did work for dev. But I had to modify it to make it work for tidepool-merge branch. I had forgotten this.

FYI - @ps2:

• This PR as merged does not build in LoopWorkspace.

Linking the PR to keep track:

• PR update progressCell for bolus display #2295: this PR - has a bug, will not build - I will fix this in PR update progressCell for bolus display, finish update for dev branch #2298
• PR update progressCell for bolus display for tidepool-merge #2263 (works when merged to tidepool-merge, Loop commit 5fbdd9b)
• PR update progressCell for bolus display for main branch #2264 (this PR was never used and was closed without merging. I forgot that dev and main are different from tidepool-merge and I transferred the tidepool-merge code change to 2295 instead of the 2264 code changes)