Fix bug in emicorr logic for finding matching ref file info

[penaguerrero]

This PR addresses a bug in the emicorr step that was discovered after merging #8270. The bug affected the matching of dataset subarray and readpatt values to ref file entries, which was causing no matching entry to be found and hence the step was skipped.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[penaguerrero]

running reg tests at: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1328/

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.26%. Comparing base (2fb073e) to head (5ac1795).
Report is 4 commits behind head on master.

Files	Patch %	Lines
jwst/emicorr/emicorr.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8375      +/-   ##
==========================================
- Coverage   75.31%   75.26%   -0.05%     
==========================================
  Files         474      474              
  Lines       38965    38999      +34     
==========================================
+ Hits        29345    29354       +9     
- Misses       9620     9645      +25     

Flag	Coverage Δ		*Carryforward flag
nightly	77.33% <ø> (-0.01%)	⬇️	Carriedforward from 2fb073e

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[hbushouse]

A bunch of regtest runs went south due to connection issues. I've restarted a test run for this PR at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1333

[hbushouse]

Regression test runs are still having trouble on jwcalibdev. So I'm just going to merge this and test standalone (locally) using the latest jwst/master.