Fix a crash when opening v11 rooms.

[pixlwave]

creator was removed in v11 instead favouring sender. This field is currently defined in the spec as required, hence the crash. https://github.com/matrix-org/matrix-spec-proposals/pull/2175

Probably best to hide whitespaces on that diff.

Fixes #7633

[sonarcloud[bot]]

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[codecov[bot]]

Codecov Report

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

Comparison is base (04c7a02) 12.21% compared to head (8085526) 12.36%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #7635 +/- ## =========================================== + Coverage 12.21% 12.36% +0.14% =========================================== Files 1648 1648 Lines 163667 163665 -2 Branches 67195 67209 +14 =========================================== + Hits 19996 20236 +240 + Misses 143026 142764 -262 - 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/7635?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/7635?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im#diff-UmlvdC9Nb2R1bGVzL01hdHJpeEtpdC9VdGlscy9FdmVudEZvcm1hdHRlci9NWEtFdmVudEZvcm1hdHRlci5t) | `16.93% <0.00%> (-0.01%)` | :arrow_down: | ... and [15 files with indirect coverage changes](https://app.codecov.io/gh/vector-im/element-ios/pull/7635/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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