Fix: Add Debit Card filter to Daily Sales and Takings

Add 'only_debit' filter to Daily Sales and Takings dropdown. Reuses
existing 'Sales.debit' language string for the filter label. Includes
filter default initialization in getSearch() to prevent PHP warnings.

Fixes #4439
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f