install: Restore treatment of DESTINATION as a single-valued keyword

The `install(RUNTIME_DEPENDENCY_SET)` form processes its arguments in a
slightly different way to other forms of the command. It handles the
`POST_...`, `PRE_...` and `DIRECTORIES` keywords separately. These
keywords are not visible to the first layer of keyword processing, so
they don't terminate multi-value keyword value parsing.

Before commit 6a1fac1450 (install: Normalize DESTINATION paths,
2024-09-18, v3.31.0-rc1~73^2), the `DESTINATION` keyword was handled as
a simple string value. That commit changed it to use a function so it
could process the value before storing it, but the function returned the
wrong value. This meant it was treated as a multi-value keyword instead
of a single-value keyword.

Fixes: #26512

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