Hide Add Email UI according to the 3 pid changes capability

[Velin92]

fixes #7645

[sonarcloud[bot]]

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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 and project coverage have no change.

Comparison is base (83e7229) 12.22% compared to head (91b6d27) 12.22%. Report is 2 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #7655 +/- ## ======================================== Coverage 12.22% 12.22% ======================================== Files 1648 1648 Lines 163619 163621 +2 Branches 67155 67156 +1 ======================================== + Hits 19997 20000 +3 + Misses 142976 142975 -1 Partials 646 646 ``` | [Flag](https://app.codecov.io/gh/vector-im/element-ios/pull/7655/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im) | Coverage Δ | | |---|---|---| | [uitests](https://app.codecov.io/gh/vector-im/element-ios/pull/7655/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im) | `55.05% <ø> (+0.01%)` | :arrow_up: | | [unittests](https://app.codecov.io/gh/vector-im/element-ios/pull/7655/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im) | `6.07% <0.00%> (-0.01%)` | :arrow_down: | 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/7655?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im) | Coverage Δ | | |---|---|---| | [Riot/Modules/Settings/SettingsViewController.m](https://app.codecov.io/gh/vector-im/element-ios/pull/7655?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vector-im#diff-UmlvdC9Nb2R1bGVzL1NldHRpbmdzL1NldHRpbmdzVmlld0NvbnRyb2xsZXIubQ==) | `0.00% <0.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/vector-im/element-ios/pull/7655/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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