Do not add arXiv classes to journals

[GlazerMann]

Already did {{cite journal}}
Adding {{citation | journal=something}}

[codecov]

Codecov Report

Merging #720 into master will decrease coverage by 1.6%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #720      +/-   ##
============================================
- Coverage     68.66%   67.06%   -1.61%     
- Complexity     1622     1623       +1     
============================================
  Files            12       12              
  Lines          3217     3218       +1     
============================================
- Hits           2209     2158      -51     
- Misses         1008     1060      +52

Impacted Files	Coverage Δ	Complexity Δ
Template.php	73.09% <100%> (-2.54%)	1452 <0> (+1)
expandFns.php	90.71% <0%> (+0.71%)	0% <0%> (ø)	⬇️

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