fix AST tests not reading last line of file

[WebFreak001]

shortenedFunction test was missing last line in the ast printer, fixed that as well here

[codecov]

Codecov Report

Merging #474 (8ffda68) into master (abeefa2) will increase coverage by 0.01%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #474      +/-   ##
==========================================
+ Coverage   83.16%   83.17%   +0.01%     
==========================================
  Files          11       11              
  Lines        8345     8350       +5     
==========================================
+ Hits         6940     6945       +5     
  Misses       1405     1405              

Impacted Files	Coverage Δ
src/dparse/astprinter.d	94.35% <ø> (ø)
src/dparse/strings.d	98.72% <0.00%> (+0.01%)	⬆️

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