fix: resolve compile error in statements.cpp

[joakimlinde]

The assert in file statement.cpp:178 refers to a variable nrows that does not exist. This causes a compile error. I opted to change the variable name rows to nrows in order to make it consistent with ncols. Please feel free to change it to the other way.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.31%. Comparing base (5c88c6f) to head (c403987).
Report is 1539 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1149       +/-   ##
===========================================
- Coverage   63.61%   52.31%   -11.30%     
===========================================
  Files         123      146       +23     
  Lines        5266     9941     +4675     
===========================================
+ Hits         3350     5201     +1851     
- Misses       1916     4740     +2824     

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