fix "true" in meal participant calculation

[wp99cp]

The funciton calcRecipeParticipants expects a number as the 5th argument, however a bool was given back from the frontend (the override checkbox value, instead of the actual value inside the override participants field)

Thanks @maede97, #228 (comment)

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[github-actions]

• Version changed since last release! Version of this release: 1.15.3 (patch).

[github-actions]

Todos before releasing a new version

• Check release notes: All new features/changes included? Date correct?
• Check help-page messages: Are they all up to date? Update screenshots. Is the date correct?
• Check preview build and test it with the productive database.
• Deploy new revision of the PDF-Export Service