Stamp fix

[lsawade]

Hi Daniel, Just a small fix for putting the stamp value to south pole.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.06%. Comparing base (11af3c6) to head (a34415e).
⚠️ Report is 20 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/auxiliaries/create_movie_GMT_global.f90	0.00%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #868      +/-   ##
==========================================
- Coverage   37.06%   37.06%   -0.01%     
==========================================
  Files         295      295              
  Lines       68633    68676      +43     
==========================================
+ Hits        25440    25452      +12     
- Misses      43193    43224      +31     

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[danielpeter]

thanks! not sure if it makes much difference. these stamps could be placed anywhere. the idea of having them at opposite poles is just to place them somewhere away from the more interesting visual areas in the middle of the image.

[lsawade]

Yes, it was just an eyesore for the globe display interpolated wavefield. I'm likely going to create a follow-up PR where I'm writing min/max values to a separate file on a per snapshot basis to normalize the wavefield with a moving average for the display without the need for stamping. since the southpole is still visible.