fix: message padding [WPB-5059]

[Garzas]

WPB-5059 [Android] Paddings between messages from the same sender are off

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• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

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What's new in this PR?

• fixed paddings and added some comments to help understand why we are calculating some paddings for message items

[github-actions]

Test Results

659 tests   659 ✔️  7m 37s ⏱️
  96 suites      0 💤
  96 files        0 ❌

Results for commit 07abb56.

♻️ This comment has been updated with latest results.

[github-actions]

APKs built during tests are available here. Scroll down to Artifacts!

[AndroidBob]

Build 1594 succeeded.

The build produced the following APK's:

• com.wire.android-v4.5.0(7977288)(7977288)-staging-compat.apk

[codecov]

Codecov Report

Merging #2384 (07abb56) into develop (0b2fed5) will increase coverage by 0.00%.
Report is 3 commits behind head on develop.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##             develop    #2384   +/-   ##
==========================================
  Coverage      41.49%   41.49%           
  Complexity      1072     1072           
==========================================
  Files            340      340           
  Lines          12187    12189    +2     
  Branches        1604     1604           
==========================================
+ Hits            5057     5058    +1     
  Misses          6650     6650           
- Partials         480      481    +1     

Files	Coverage Δ
...roid/ui/settings/devices/DeviceDetailsViewModel.kt	65.17% <28.57%> (-0.28%)	⬇️

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[github-actions]

APKs built during tests are available here. Scroll down to Artifacts!