Use bounds height change in adjustCollectionViewInsets

[leonspok]

This change is needed only for the case when placeMessagesFromBottom = true.

Before fix:

After fix:

[codecov-io]

Codecov Report

Merging #623 into master will decrease coverage by 11.65%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #623       +/-   ##
===========================================
- Coverage   72.51%   60.85%   -11.66%     
===========================================
  Files          19       92       +73     
  Lines        1215     4892     +3677     
===========================================
+ Hits          881     2977     +2096     
- Misses        334     1915     +1581

Impacted Files	Coverage Δ
...Source/ChatController/BaseChatViewController.swift	70.33% <100%> (+1.12%)	⬆️
...otos/PhotosInputWithPlaceholdersDataProvider.swift	80.76% <0%> (ø)
ChattoAdditions/Source/Input/TabInputButton.swift	94.11% <0%> (ø)
...s/CircleProgressIndicatorView/CircleIconView.swift	68.04% <0%> (ø)
...s/PhotoMessageCollectionViewCellDefaultStyle.swift	84.09% <0%> (ø)
.../Chat Items/BaseMessage/BaseMessagePresenter.swift	62.61% <0%> (ø)
ChattoAdditions/Source/Common/Observable.swift	100% <0%> (ø)
...aceholder/PhotosInputPlaceholderDataProvider.swift	33.33% <0%> (ø)
...ditions/Source/Common/UIEdgeInsets+Additions.swift	100% <0%> (ø)
...aceholder/PhotosInputPlaceholderCellProvider.swift	0% <0%> (ø)
... and 64 more

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