This update removes duplicate leave type definitions that were redundantly created in Belgium and Switzerland payroll modules. These duplicates were already properly defined in the Time Off module, so the payroll modules now reference the existing definitions instead. This cleanup reduces data redundancy and simplifies maintenance.

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test_l10n_be
l10n_ch

Before this commit, both l10n modules were creating demo leave types almost identical to the demo and data already defined in the `hr_holidays` module.
This commit removes those duplicates and refer to the equivalent of the Time Off module.