Fix situation where layout was being ignored when reading cubes.

[joa-quim]

Set pad = 0 before reading cubes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.42857% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.72%. Comparing base (73095bc) to head (dee92d9).

Files with missing lines	Patch %	Lines
src/gmt_main.jl	46.42%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2036      +/-   ##
==========================================
- Coverage   80.77%   80.72%   -0.06%     
==========================================
  Files         200      200              
  Lines       31597    31619      +22     
==========================================
+ Hits        25524    25525       +1     
- Misses       6073     6094      +21     

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