fix: fleeting vowel inference

[noomorph]

Fixes declension for words ending with ėnj, ėc, ėk, when no additional form (like denj - dnja) is available.

[coveralls]

Pull Request Test Coverage Report for Build 7479894130

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.09%) to 94.559%

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Totals
Change from base Build 7377672886:	0.09%
Covered Lines:	1512
Relevant Lines:	1596

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💛 - Coveralls

[github-actions[bot]]

:tada: This PR is included in version 2.2.6 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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