fix getBoundsCheckedContentOffset when bounds is bigger than contentSize

[michaelknoch]

Fixes #

Type of change:

Motivation (current vs expected behavior)

Our UIScrollview implementation currently jumps to the end of the list when onPan gets called and the contentSize dimensions are smaller than the bounds dimensions of the scrollview.

https://user-images.githubusercontent.com/5617793/107209784-914b2800-6a03-11eb-9d28-c69190512963.mp4

Please check if the PR fulfills these requirements

• [ ] Self-review: I am confident this is the simplest and clearest way to achieve the expected behaviour
• [ ] There are no dependencies on other PRs or I have linked dependencies through Zenhub
• [ ] The commit messages are clean and understandable
• [ ] Tests for the changes have been added (for bug fixes / features)

[codecov[bot]]

Codecov Report

Merging #317 (c72668c) into master (0e44ce4) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
+ Coverage   51.42%   51.46%   +0.03%     
==========================================
  Files          87       87              
  Lines        2872     2874       +2     
==========================================
+ Hits         1477     1479       +2     
  Misses       1395     1395              

Impacted Files	Coverage Δ
Sources/UIScrollView.swift	88.23% <100.00%> (+0.35%)	:arrow_up:

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