Improve SegmentedPicker UI

[alfogrillo]

Description

This PR slightly changes the UI of the SegmentedPicker component currently being used just in the poll history.

Before	After

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Base: 12.09% // Head: 12.08% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (95eeb05) compared to base (3972da8).
Patch coverage: 5.55% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7341      +/-   ##
===========================================
- Coverage    12.09%   12.08%   -0.01%     
===========================================
  Files         1637     1637              
  Lines       161830   161844      +14     
  Branches     66429    66436       +7     
===========================================
- Hits         19566    19563       -3     
- Misses      141618   141635      +17     
  Partials       646      646              

Flag	Coverage Δ
unittests	5.97% <3.03%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Config/CryptoSDKConfiguration.swift	0.00% <0.00%> (ø)
...ot/Categories/MatrixSDKCrypto+LocalizedError.swift	0.00% <ø> (ø)
Riot/Managers/Settings/RiotSettings.swift	88.42% <ø> (ø)
Riot/Modules/Analytics/Analytics.swift	9.41% <0.00%> (ø)
Riot/Modules/Application/LegacyAppDelegate.m	14.55% <ø> (ø)
...Modules/Home/AllChats/AllChatsViewController.swift	29.35% <0.00%> (ø)
Riot/Modules/Settings/SettingsViewController.m	0.00% <0.00%> (ø)
...odules/Room/PollHistory/View/SegmentedPicker.swift	36.66% <5.88%> (-14.50%)	⬇️
Config/CommonConfiguration.swift	86.80% <33.33%> (ø)
... and 9 more

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[flescio]

LGTM