View Transitions: Fix admin opt-in checkbox appears stretched on mobile

[mukeshpanchal27]

Summary

Fixes #2087

Screenshots

Before

After

[github-actions]

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Co-authored-by: mukeshpanchal27 <mukesh27@git.wordpress.org>
Co-authored-by: westonruter <westonruter@git.wordpress.org>

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.15%. Comparing base (8e5f193) to head (35249ee).
Report is 2 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2088   +/-   ##
=======================================
  Coverage   67.14%   67.15%           
=======================================
  Files          93       93           
  Lines        7740     7739    -1     
=======================================
  Hits         5197     5197           
+ Misses       2543     2542    -1     

Flag	Coverage Δ
multisite	67.15% <ø> (+<0.01%)	⬆️
single	36.54% <ø> (+<0.01%)	⬆️

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