Include only InStock boxes in StockOverview chart

[pylipp]

2.0: Include only InStock boxes in StockOverview chart

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.87%. Comparing base (6a42ea2) to head (c90c7b0). Report is 61 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1574 +/- ## ======================================= Coverage 85.87% 85.87% ======================================= Files 229 229 Lines 21754 21754 Branches 1940 1940 ======================================= Hits 18682 18682 Misses 3036 3036 Partials 36 36 ``` | [Flag](https://app.codecov.io/gh/boxwise/boxtribute/pull/1574/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boxwise) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/boxwise/boxtribute/pull/1574/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boxwise) | `99.03% <ø> (ø)` | | | [frontend](https://app.codecov.io/gh/boxwise/boxtribute/pull/1574/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boxwise) | `82.68% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=boxwise#carryforward-flags-in-the-pull-request-comment) to find out more.

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