[WIP] Fix wrong spacing for chemkin spacing default temperature range

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>wrong spacing for chemkin spacing default temperature range</issue_title>
<issue_description>

Bug Description

The spacing for the default thermo temperature range in a chemkin file is different for the surface one than for the gas one:

Surface code

RMG-Py/rmgpy/chemkin.pyx

Line 2201 in 3b6dd79

f.write(' 300.000 1000.000 5000.000\n\n')

Gas code

RMG-Py/rmgpy/chemkin.pyx

Line 2134 in 3b6dd79

f.write(' 300.000 1000.000 5000.000\n\n')

This prevents the default temperature ranges from getting read in.

How To Reproduce

Generate an RMG surface mechanism and then try to read in the chemkin file.
</issue_description>

Comments on the Issue (you are @copilot in this section)

[rwest]

I think this is fixed in #2955 ?