update to checkConfig utility function to remove null characters from column names of DynamicTable

[cechava]

fixes #365

[codecov]

Codecov Report

Merging #366 (0c46872) into master (53965b6) will decrease coverage by 0.03%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   85.67%   85.64%   -0.04%     
==========================================
  Files         124      124              
  Lines        4615     4625      +10     
==========================================
+ Hits         3954     3961       +7     
- Misses        661      664       +3     

Impacted Files	Coverage Δ
+types/+util/+dynamictable/checkConfig.m	91.80% <62.50%> (-4.43%)	⬇️
+tests/+system/DynamicTableTest.m	99.45% <100.00%> (+<0.01%)	⬆️

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