Improve sensitivity of last two integration tests

[bbc2]

Those tests were only checking that the output was nonempty, so they would pretty much never detect anything fishy. We could go further but it's nontrivial because the output is nondeterministic (because of temporary files) and it's unclear if we want to build complex regexes in the test suite right now. In the meantime, here's a basic improvement.

---

TODO

• [x] Use cargo fmt
• [ ] ~~Add necessary tests~~
• [ ] ~~Add changelog entry~~
• [ ] ~~Update default config/theme in README (if applicable)~~
• [ ] ~~Update man page at lsd/doc/lsd.md (if applicable)~~

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[codecov-commenter]

Codecov Report

Merging #904 (e61b419) into master (762e724) will decrease coverage by 0.82%. Report is 1 commits behind head on master. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #904      +/-   ##
==========================================
- Coverage   86.53%   85.71%   -0.82%     
==========================================
  Files          49       49              
  Lines        4848     4852       +4     
==========================================
- Hits         4195     4159      -36     
- Misses        653      693      +40     

Files Changed	Coverage Δ
tests/integration.rs	100.00% <100.00%> (ø)

... and 13 files with indirect coverage changes

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