refactor getExpandedStyle.ts

[HiteshGorana]

• using the chaining operator instead of the ternary operator
• added type annotation in getExpandedStyle
• duplicated calculation javascript Math.abs(speed) * 10 * -1 into a variable

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Name	Status	Preview	Comments	Updated (UTC)
react-scroll-parallax	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 7, 2023 6:57am

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 :tada:

Comparison is base (2ff50ca) 85.65% compared to head (437df08) 85.71%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #209 +/- ## ========================================== + Coverage 85.65% 85.71% +0.06% ========================================== Files 19 19 Lines 237 238 +1 Branches 51 51 ========================================== + Hits 203 204 +1 Misses 33 33 Partials 1 1 ``` | [Impacted Files](https://codecov.io/gh/jscottsmith/react-scroll-parallax/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J+Scott+Smith) | Coverage Δ | | |---|---|---| | [...ponents/ParallaxBanner/helpers/getExpandedStyle.ts](https://codecov.io/gh/jscottsmith/react-scroll-parallax/pull/209?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J+Scott+Smith#diff-c3JjL2NvbXBvbmVudHMvUGFyYWxsYXhCYW5uZXIvaGVscGVycy9nZXRFeHBhbmRlZFN0eWxlLnRz) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J+Scott+Smith). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=J+Scott+Smith)

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