fix the output table format

[zktuong]

So now the output table in return_tables=T gives the same layout as per the plot, particularly for symmetrical=F situation. Also rearranged the construction of the interaction_count output to be consistent with the options.

[codecov[bot]]

Codecov Report

Merging #72 (eac92aa) into master (a0a8aee) will decrease coverage by 0.33%. The diff coverage is 23.07%.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   72.51%   72.19%   -0.33%     
==========================================
  Files           9        9              
  Lines        1863     1870       +7     
==========================================
- Hits         1351     1350       -1     
- Misses        512      520       +8     

Impacted Files	Coverage Δ
R/plot_cpdb_heatmap.R	67.16% <23.07%> (-9.51%)	:arrow_down:

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