aobasis: remove unused variable

[codecov[bot]]

Codecov Report

Merging #742 (b9920b5) into master (2a31d70) will decrease coverage by 0.0%. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #742     +/-   ##
========================================
- Coverage    51.6%   51.6%   -0.1%     
========================================
  Files         292     292             
  Lines       27031   27029      -2     
========================================
- Hits        13971   13969      -2     
  Misses      13060   13060             

Impacted Files	Coverage Δ
src/libxtp/aobasis.cc	88.3% <ø> (-0.2%)	:arrow_down:

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[junghans]

@votca-bot changelog: Remove unused variables

[junghans]

@JensWehner please review