Remove unnecessary 'else'

Some server parameters may depend on one another. For example,
audio_bit_rate is meaningless if audio is false.

But it is inconsistent to disable some parameters based on these
dependencies checks, but not others. Handling all dependencies between
parameters would add too much complexity for no benefit.

So just pass individual parameters independently.

PR #3978 <https://github.com/Genymobile/scrcpy/pull/3978>