Only use the sender when rendering the room creation event.

[pixlwave]

On Room v11 it is possible that the sender could put in a fake creator. Don't allow this to happen.

The changelog already exists for this as #7633

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

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[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.14% :tada:

Comparison is base (d3e64c1) 12.21% compared to head (a68c6f0) 12.36%. Report is 1 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #7640 +/- ## =========================================== + Coverage 12.21% 12.36% +0.14% =========================================== Files 1648 1648 Lines 163668 163660 -8 Branches 67195 67206 +11 =========================================== + Hits 19996 20236 +240 + Misses 143027 142759 -268 - Partials 645 665 +20 ``` | Flag | Coverage Δ | | |---|---|---| | uitests | `55.05% <ø> (ø)` | | | unittests | `6.21% <0.00%> (+0.14%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/vector-im/element-ios/pull/7640?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im) | Coverage Δ | | |---|---|---| | [...MatrixKit/Utils/EventFormatter/MXKEventFormatter.m](https://app.codecov.io/gh/vector-im/element-ios/pull/7640?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im#diff-UmlvdC9Nb2R1bGVzL01hdHJpeEtpdC9VdGlscy9FdmVudEZvcm1hdHRlci9NWEtFdmVudEZvcm1hdHRlci5t) | `16.97% <0.00%> (+0.04%)` | :arrow_up: | ... and [15 files with indirect coverage changes](https://app.codecov.io/gh/vector-im/element-ios/pull/7640/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im)

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