Fix missing newline after "no files changed"

[sachinmk27]

Address #5305
Summary
It was a case of operator precedence.
let msg = "\n" + isTrue ? "a": "b" // a
Added the ternary operator expression inside a pair of simple brackets.
let msg = "\n" + (isTrue ? "a": "b") // <newline>a

Test plan
Firstly, I tried out the changes in create-react-app. The screenshots are of the same.
Secondly, I ran jest -o after making my changes in the jest repo. All the relevant tests passed.

Before:

After:

[gaearon]

Heh, sorry I did that incorrect edit 😄

[codecov-io]

Codecov Report

Merging #5308 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5308   +/-   ##
=======================================
  Coverage   61.23%   61.23%           
=======================================
  Files         205      205           
  Lines        6891     6891           
  Branches        3        3           
=======================================
  Hits         4220     4220           
  Misses       2670     2670           
  Partials        1        1

Impacted Files	Coverage Δ
.../src/get_no_test_found_related_to_changed_files.js	0% <ø> (ø)	⬆️

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[gaearon]

The build has previously passed, I think we can merge this! I just edited the changelog to use PR link instead of the issue number.

Nice work, thanks for finding this!

[sachinmk27]

Thanks a lot @gaearon

[rickhanlonii]

Tested locally, works great

[github-actions]

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