Disabled prefetching to improve scroll performance

[AntonPalich]

No description provided.

[codecov-io]

Codecov Report

Merging #629 into master will decrease coverage by 0.09%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master    #629     +/-   ##
========================================
- Coverage   60.99%   60.9%   -0.1%     
========================================
  Files          92      92             
  Lines        4925    4929      +4     
========================================
- Hits         3004    3002      -2     
- Misses       1921    1927      +6

Impacted Files	Coverage Δ
...Source/ChatController/BaseChatViewController.swift	70.52% <100%> (+0.09%)	⬆️
Chatto/Source/Utils.swift	90.9% <100%> (+1.43%)	⬆️
...Chat Items/TextMessages/Views/TextBubbleView.swift	83.16% <0%> (-3.07%)	⬇️

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