Fix gcc compiler warnings in MODIS interpolator

[djhoese]

We get warnings when the modis interpolator cython module is compiled. This PR fixes them. Because the tests pass I assume these changes are fine. Without the rearranging of the parameters in the one modified expression tests fail.

geotiepoints/_modis_interpolator.c: In function ‘__pyx_fuse_0__pyx_f_12geotiepoints_19_modis_interpolator_17MODISInterpolator__get_coords_1km’:
geotiepoints/_modis_interpolator.c:27438:33: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
27438 |   for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
      |                                 ^
geotiepoints/_modis_interpolator.c:27482:35: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
27482 |     __pyx_t_4 = (__pyx_v_fine_idx >= (__pyx_v_fine_pixels_per_scan - __pyx_v_half_scan_length));
      |                                   ^~
geotiepoints/_modis_interpolator.c: In function ‘__pyx_fuse_1__pyx_f_12geotiepoints_19_modis_interpolator_17MODISInterpolator__get_coords_1km’:
geotiepoints/_modis_interpolator.c:27622:33: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
27622 |   for (__pyx_t_3 = 0; __pyx_t_3 < __pyx_t_2; __pyx_t_3+=1) {
      |                                 ^
geotiepoints/_modis_interpolator.c:27666:35: warning: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Wsign-compare]
27666 |     __pyx_t_4 = (__pyx_v_fine_idx >= (__pyx_v_fine_pixels_per_scan - __pyx_v_half_scan_length));
      |                                   ^~

• Closes #xxxx
• Tests added
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff
• Fully documented

[djhoese]

Just checked CI and the Windows compiler warns on a lot more stuff, but I'm not too concerned about them...for now.

[coveralls]

coverage: 87.965%. remained the same
when pulling 8e50a9b on djhoese:bugfix-compile-warnings
into a28d54c on pytroll:main.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.69%. Comparing base (ffc1628) to head (8e50a9b).
⚠️ Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   88.43%   88.69%   +0.25%     
==========================================
  Files          20       20              
  Lines        1522     1521       -1     
==========================================
+ Hits         1346     1349       +3     
+ Misses        176      172       -4     

Flag	Coverage Δ
unittests	88.69% <100.00%> (+0.25%)	⬆️

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[mraspaud]

LGTM