Pass editorMode into text entry's Inequality reference on the equality demo page

[sjd210]

The bug is that text entry sometimes doesn't work on switching modes on the demo page. To recreate:

1. Go to isaacphysics.org/equality (logged into an admin account)
2. Choose ‘Nuclear Physics’ from the dropdown
3. Type “H”
4. Click to enter Inequality modal
5. Submit
6. Try to edit the text input prescripts (e.g. "{}^{2}_{}H")

This is broken (only for the demo page) due to the editorMode for inequality text entry (hiddenEditorRef) only being set when the main inequality editorMode changes, but the page reload forcing text entry to be generated again. This regenerated hiddenEditorRef therefore doesn’t have editorMode set, so it is set to the default of “logic”.

The solution is simply to pass the main editorMode into hiddenEditorRef’s editorMode when it is generated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.61%. Comparing base (346c713) to head (2203a7c).
Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1249    +/-   ##
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  Coverage   36.61%   36.61%            
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  Files         451      451            
  Lines       19779    19779            
  Branches     6518     5847   -671     
========================================
  Hits         7243     7243            
- Misses      11881    12498   +617     
+ Partials      655       38   -617     

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[sjd210]

We could also attach the needed Inequality update to this branch once the relevant Inequality PR is merged.