fix latexify_recipes.jl for real values of type Complex

[karlwessel]

This fixes latexify for Complex symbolic values with no imaginary part.

A Complex value with no imaginary part isreal but is not comparable, but the real part is.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.21%. Comparing base (6202fa4) to head (91b5dd9).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1375       +/-   ##
===========================================
+ Coverage    3.95%   79.21%   +75.25%     
===========================================
  Files          51       51               
  Lines        4824     4913       +89     
===========================================
+ Hits          191     3892     +3701     
+ Misses       4633     1021     -3612     

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