Modify prune to only remove *.d.ts files, not all .ts files

[mahnuh]

When building a CLI with code scaffolding you might have some necessary .ts template files. At the moment those files would just disappear and the CLI obviously is not able to find the templates.
Removing just the .d.ts files fixes this issue.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @mahnuh to sign the Salesforce.com Contributor License Agreement.

[codecov]

Codecov Report

Merging #44 into master will decrease coverage by 0.83%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage    34.7%   33.87%   -0.84%     
==========================================
  Files          18       19       +1     
  Lines         631      682      +51     
  Branches      101      106       +5     
==========================================
+ Hits          219      231      +12     
- Misses        388      427      +39     
  Partials       24       24

Impacted Files	Coverage Δ
src/tarballs/build.ts	8.79% <ø> (ø)	⬆️
src/tarballs/bin.ts	15.38% <0%> (-24.62%)	⬇️
src/tarballs/index.ts	100% <0%> (ø)
src/tarballs/node.ts	10.2% <0%> (+3.53%)	⬆️
src/log.ts	75% <0%> (+8.33%)	⬆️

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[jdx]

thanks for the contribution!

[jdx]

looking at this again, it probably makes sense to just get rid of this. There is any number of reasons why someone might want these files included. We should probably just include them to be safe.

[oclif-bot]

🎉 This PR is included in version 1.13.34 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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