Fix settings screens items alignment

[aringenbach]

Fixes alignment issues inside all settings screen.

iOS has some inconsistencies on what is returned by separatorInset property of a cell. This uses the tableView separatorInset instead, to make sure that everything is always perfectly aligned.

Also it sets MXKTableViewCellWithLabelAndTextField's label to be left aligned instead of center since it could break alignment in some cases.

Before	After

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[MaximeEvrard42]

LGTM !

[phloux]

LGTM too

[codecov-commenter]

Codecov Report

Merging #6311 (1203d94) into develop (5aba712) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #6311      +/-   ##
===========================================
- Coverage     6.23%    6.23%   -0.01%     
===========================================
  Files         1440     1440              
  Lines       155383   155385       +2     
  Branches     62528    62528              
===========================================
- Hits          9684     9681       -3     
- Misses      145296   145301       +5     
  Partials       403      403              

Impacted Files	Coverage Δ
...oomDetails/EnterNewRoomDetailsViewController.swift	0.00% <0.00%> (ø)
...Modules/Room/Settings/RoomSettingsViewController.m	0.00% <0.00%> (ø)
...curity/ManageSession/ManageSessionViewController.m	0.00% <0.00%> (ø)
...Modules/Settings/Security/SecurityViewController.m	0.00% <0.00%> (ø)
Riot/Modules/Settings/SettingsViewController.m	0.00% <0.00%> (ø)
...ojiPicker/Data/EmojiMart/EmojiItem+EmojiMart.swift	95.34% <0.00%> (-0.31%)	⬇️
...ules/MatrixKit/Models/Room/MXKRoomBubbleCellData.m	16.75% <0.00%> (-0.12%)	⬇️

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