refactor: Simplify cursor-pointer mixin for inputs

[mfranzke]

Proposed changes

• We could simplify the :is selector by merging two declarations
• We don't need to set cursor: pointer, as this is even already the default.

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/refactor-simplify-cursor-pointer-mixin-for-inputs

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