Fix plurals not being detected when count is a CallExpression

[glsignal]

Why am I submitting this PR

Addresses https://github.com/i18next/i18next-parser/issues/1015 where the JavaScript lexer would no longer correctly identify plurals where the count was a CallExpression

Does it fix an existing ticket?

Yes #1015

Checklist

• [x] only relevant code is changed (make a diff before you submit the PR)
• [x] tests are included and pass: yarn test (see details here)
• [x] ~documentation is changed or added~

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.35%. Comparing base (168c8d5) to head (80ea05f). Report is 18 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1022 +/- ## ========================================== - Coverage 95.40% 95.35% -0.05% ========================================== Files 11 10 -1 Lines 1937 1918 -19 ========================================== - Hits 1848 1829 -19 Misses 89 89 ```

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[karellm]

This is now part of 9.0.1. Thanks for the PR!