Fix test_interpolate_range format writing issue

[Benjamin-Gunn]

Description:

Fixes a bug when running model_mod_check with a 3D sphere model, where test 5 would result in an error due to the formatting of three write statements in test_interpolate_range_threed_sphere.f90.

Fixes issue

Fixes #487

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Documentation changes needed?

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.

Tests

Tested with panda_models branch on achauphan@8ed5a96

Checklist for merging

• Updated changelog entry
• Documentation updated
• Update conf.py

Checklist for release

• Merge into main
• Create release from the main branch with appropriate tag
• Delete feature-branch

Testing Datasets

• Dataset needed for testing available upon request
• Dataset download instructions included
• No dataset needed

[hkershaw-brown]

Approved! Thanks for the fix @Benjamin-Gunn