Fix commented tests

[totakke]

I forgot to fix commented tests of predicates and old reader/writer in cljam.io.util. This PR fixes them.

[codecov]

Codecov Report

Merging #85 into master will increase coverage by 0.72%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage    81.9%   82.63%   +0.72%     
==========================================
  Files          60       60              
  Lines        4140     4140              
  Branches      432      432              
==========================================
+ Hits         3391     3421      +30     
+ Misses        317      287      -30     
  Partials      432      432

Impacted Files	Coverage Δ
src/cljam/io/vcf.clj	94.73% <0%> (+5.26%)	⬆️
src/cljam/io/sam.clj	97.77% <0%> (+8.88%)	⬆️
src/cljam/io/sequence.clj	96.42% <0%> (+21.42%)	⬆️
src/cljam/io/util.clj	100% <0%> (+37.5%)	⬆️

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[alumi]

Merged. Thank you for the fixes!