Fix f-string and remove forced crash in 15-Thermal-convection-with-units.py (release candidate)#38

ss2098 wants to merge 1 commit intounderworldcode:uw3-release-candidateunderworldcode/underworld3:uw3-release-candidatefrom

ss2098:fix-thermal-convection-rcss2098/underworld3:fix-thermal-convection-rcCopy head branch name to clipboard