fix: allow custom events when idle

[pauldambra]

We want to use custom events more... and we're using one to record when a session goes idle - which we immediately drop because the session is idle 🤦

Lets allow custom events into the buffer while idle

[github-actions]

Size Change: +180 B (0%)

Total Size: 781 kB

Filename	Size	Change
dist/array.full.js	183 kB	+45 B (0%)
dist/array.js	124 kB	+45 B (0%)
dist/es.js	124 kB	+45 B (0%)
dist/module.js	125 kB	+45 B (0%)

ℹ️ View Unchanged

Filename	Size
dist/exception-autocapture.js	12 kB
dist/recorder-v2.js	105 kB
dist/recorder.js	58.6 kB
dist/surveys.js	48.8 kB

_{compressed-size-action}

[marandaneto]

which we immediately drop because the session is idle 🤦

Makes sense 😅 idle logic was 🤌