Fix wrong text key in expressions

[TomasEng]

Description

The reference to the subexpression text had wrong casing, so the text was not found.

Related issue

• Re-factor expressions editor to be more generic and re-usable #12183

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.10%. Comparing base (a43f44c) to head (fc1b182).
Report is 1 commits behind head on main.

❗ Current head fc1b182 differs from pull request most recent head 22bd572. Consider uploading reports for the commit 22bd572 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12493   +/-   ##
=======================================
  Coverage   88.10%   88.10%           
=======================================
  Files        1271     1271           
  Lines       18321    18321           
  Branches     2263     2263           
=======================================
  Hits        16142    16142           
  Misses       1909     1909           
  Partials      270      270           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mlqn]

💯