While moving code, commit 874eaec487 added
a condition `if (displayId == 0)` to register a rotation watcher,
without good reasons.
This condition was kept when the rotation watcher was moved to a
fallback in e26bdb07a2.
Note: use `git show -b` to show this commit ignoring whitespace changes.
Refs #5428 <https://github.com/Genymobile/scrcpy/issues/5428>