Update cfg files

[chengzhuzhang]

Description

• Closes [Bug]: Incorrect reference_name for "GPCP_v3.2" in zonal_mean_xy_model_vs_obs.cfg #810 and another issue caught when refactor: CDAT Migration: Refactor annual_cycle_zonal_mean set #798 (comment)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)