Fix printing of variable names in IJuliaMode

[odow]

Closes #2422

[codecov]

Codecov Report

Merging #2423 (b837d96) into master (d2398ad) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2423      +/-   ##
==========================================
- Coverage   92.27%   92.26%   -0.02%     
==========================================
  Files          43       43              
  Lines        4623     4629       +6     
==========================================
+ Hits         4266     4271       +5     
- Misses        357      358       +1     

Impacted Files	Coverage Δ
src/print.jl	91.34% <100.00%> (-0.16%)	⬇️

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