Modified declarations from vars to const (#22070)
Modified declarations from vars to const (#22070)

Summary:
Replaces the keywords `var` with `const` in `Libraries/Lists/ListView/ListViewDataSource.js`
Pull Request resolved: https://github.com/facebook/react-native/pull/22070

Differential Revision: D12895068

Pulled By: TheSavior

fbshipit-source-id: f191158396a0f03bb78942a57b08ec96348a9b32

pandiaraj44/react-native,pandiaraj44/react-native,exponentjs/react-native,exponent/react-native,arthuralee/react-native,myntra/react-native,exponent/react-native,exponent/react-native,exponentjs/react-native,exponent/react-native,myntra/react-native,javache/react-native,exponentjs/react-native,exponent/react-native,pandiaraj44/react-native,exponent/react-native,janicduplessis/react-native,janicduplessis/react-native,arthuralee/react-native,arthuralee/react-native,pandiaraj44/react-native,myntra/react-native,hammerandchisel/react-native,hoangpham95/react-native,exponent/react-native,janicduplessis/react-native,hoangpham95/react-native,pandiaraj44/react-native,hammerandchisel/react-native,facebook/react-native,janicduplessis/react-native,exponentjs/react-native,javache/react-native,javache/react-native,arthuralee/react-native,facebook/react-native,hammerandchisel/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,hoangpham95/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,pandiaraj44/react-native,javache/react-native,exponentjs/react-native,hoangpham95/react-native,javache/react-native,myntra/react-native,facebook/react-native,hoangpham95/react-native,hoangpham95/react-native,exponentjs/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,facebook/react-native,myntra/react-native,hammerandchisel/react-native,exponentjs/react-native,hammerandchisel/react-native,javache/react-native,facebook/react-native,arthuralee/react-native,janicduplessis/react-native,hoangpham95/react-native,facebook/react-native,hammerandchisel/react-native,myntra/react-native,pandiaraj44/react-native,janicduplessis/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponent/react-native,javache/react-native,javache/react-native,exponentjs/react-native,facebook/react-native,hammerandchisel/react-native