PseudoID fixes for complement tests

[codecov[bot]]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (162387a) 58.72% compared to head (217db56) 58.76%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #417 +/- ## ========================================== + Coverage 58.72% 58.76% +0.03% ========================================== Files 51 51 Lines 7096 7098 +2 ========================================== + Hits 4167 4171 +4 + Misses 2537 2536 -1 + Partials 392 391 -1 ``` | [Files](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/417?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org) | Coverage Δ | | |---|---|---| | [performjoin.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/417?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-cGVyZm9ybWpvaW4uZ28=) | `60.21% <25.00%> (+0.42%)` | :arrow_up: | | [eventcrypto.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/417?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-ZXZlbnRjcnlwdG8uZ28=) | `59.47% <71.42%> (-0.37%)` | :arrow_down: | | [handlejoin.go](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/417?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org#diff-aGFuZGxlam9pbi5nbw==) | `72.96% <20.00%> (-0.10%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/matrix-org/gomatrixserverlib/pull/417/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=matrix-org)

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