Chore: refactor code in isDataURI validator

[ezkemboi]

Clean up code in isDataURI validator

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

[codecov]

Codecov Report

Merging #1556 (1486daa) into master (787df19) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1556   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           99       100    +1     
  Lines         1776      1795   +19     
=========================================
+ Hits          1776      1795   +19     

Impacted Files	Coverage Δ
src/lib/isDataURI.js	100.00% <100.00%> (ø)
src/index.js	100.00% <0.00%> (ø)
src/lib/isMobilePhone.js	100.00% <0.00%> (ø)
src/lib/isLicensePlate.js	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 787df19...1486daa. Read the comment docs.

[renanmontebelo]

I believe you should only include src/lib/isDataURI.js because validator.js and validato.min.js are automatically generated by npm test. Also, if you remove these files you would be avoiding/resolving the merge conflict.