fix(app): Disable ReadMore component for FileTree

[nellh]

Fixes issues with the FileTree component getting truncated by the ReadMore wrapper component. This will always show the full file listing now and tooltips are no longer cut off.

I gave scrolling within the file tree a try but this complicated navigation (especially on small screens) more than I think it helps with the few datasets that have a very large top level listings. Since we collapse directories anyways, it's rare enough to have a huge top level page that I think we should just leave the top level visible.

[codecov]

Codecov Report

Merging #2633 (58a0872) into master (6f58fd8) will decrease coverage by 0.01%.
The diff coverage is 5.88%.

@@            Coverage Diff             @@
##           master    #2633      +/-   ##
==========================================
- Coverage   32.18%   32.16%   -0.02%     
==========================================
  Files         589      589              
  Lines       35673    35647      -26     
  Branches      903      902       -1     
==========================================
- Hits        11481    11467      -14     
+ Misses      24062    24050      -12     
  Partials      130      130              

Impacted Files	Coverage Δ
...app/src/scripts/dataset/routes/dataset-default.tsx	0.00% <0.00%> (ø)
...pp/src/scripts/dataset/routes/snapshot-default.tsx	0.00% <0.00%> (ø)
...es/openneuro-components/src/read-more/ReadMore.tsx	100.00% <100.00%> (ø)

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