fix: RangePicker.defaultPickerValue has no effect if showTime is set

[thommesZip]

I am trying to fix this Bug I also ran into on the Ant Design range picker.

[vercel]

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🔍 Inspect: https://vercel.com/react-component/picker/2cgKbGZcpAPsjP4vCNSjwbrqgwBi
✅ Preview: https://picker-git-fork-thommeszip-fix-range-pic-96e96a-react-component.vercel.app

[codecov]

Codecov Report

Merging #291 (9b24b73) into master (e562185) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 9b24b73 differs from pull request most recent head ee4e619. Consider uploading reports for the commit ee4e619 to get more accurate results

@@           Coverage Diff           @@
##           master     #291   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files          45       45           
  Lines        2114     2116    +2     
  Branches      614      624   +10     
=======================================
+ Hits         2104     2106    +2     
  Misses          8        8           
  Partials        2        2           

Impacted Files	Coverage Δ
src/RangePicker.tsx	100.00% <ø> (ø)
src/PickerPanel.tsx	100.00% <100.00%> (ø)

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