fix(ChatMessage): adjust styles for Teams theme

[mnajdova]

No description provided.

[codecov]

Codecov Report

Merging #986 into master will decrease coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
- Coverage   81.11%   81.08%   -0.04%     
==========================================
  Files         671      671              
  Lines        8617     8621       +4     
  Branches     1452     1520      +68     
==========================================
  Hits         6990     6990              
- Misses       1612     1616       +4     
  Partials       15       15

Impacted Files	Coverage Δ
.../themes/teams/components/Chat/chatMessageStyles.ts	16.66% <0%> (-2.57%)	⬇️

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