Prefer short circuit operators and membership test

[pjljvandelaar]

Dear Audio_wavefiles developer,

Using the rejuvenation crate, I found and replaced all places that should use the short circuit operators. Furthermore, I found and replaced all places that should use the membership test.

Greetings, Pierre

Problem detected and solved by Rejuvenation-Ada crate

[pjljvandelaar]

For more information on short circuit operators see adaic

[pjljvandelaar]

For more information on membership tests see e.g. ada-auth