fix obliquity input test in astronomy.F90

[japhir]

Description
In one input check it said obliq in stead of obliq_in.

also, to answer the comment with:
QUESTION : ARE THESE THE RIGHT LIMITS ???

I am not sure if the limits should be based on the physically possible values, or on the values for Earth specifically.

Earth's orbital eccentricity has varied between 0 and 0.067 for the past 100 Myr, so maybe a test more like 0 to 0.1 would be more suited?

Earth's obliquity has varied from 22° to 24.5° in the same time period, so a better range to check would be something like 10° to 40°? A negative value would not make sense, I think. It should be between 0° and 180°.

Earth's longitude of perihelion with respect to the moving equinox rotates and librates, so it does vary between 0° and 360°.

I could implement these changes in this pull request if desired.

These are the equivalent lines in shr_orb_mod.F90:
https://github.com/ESCOMP/CDEPS/blob/8197f05ef2549d3c53e4050c9821a683e2728bab/share/shr_orb_mod.F90#L27-L33

Fixes # (issue)

How Has This Been Tested?
no testing, used github edit feature because I just came across the typo.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes