Fix loading indicator on the reference sequence selector getting stuck

[cmdcolin]

Fixes #2118

Gets rid of useMemo statement. It could use assembly.regions as the parameter for useMemo but it is more straightforward i think to not useMemo here

[codecov]

Codecov Report

Merging #2119 (8e63408) into main (045d35c) will increase coverage by 3.17%.
The diff coverage is 62.99%.

❗ Current head 8e63408 differs from pull request most recent head beb7000. Consider uploading reports for the commit beb7000 to get more accurate results

@@            Coverage Diff             @@
##             main    #2119      +/-   ##
==========================================
+ Coverage   58.84%   62.01%   +3.17%     
==========================================
  Files         459      476      +17     
  Lines       21390    22788    +1398     
  Branches     4986     5350     +364     
==========================================
+ Hits        12587    14133    +1546     
+ Misses       8492     8374     -118     
+ Partials      311      281      -30     

Impacted Files	Coverage Δ
packages/core/BaseFeatureWidget/index.ts	75.00% <ø> (ø)
packages/core/Plugin.ts	100.00% <ø> (ø)
packages/core/ReExports/modules.ts	75.00% <ø> (ø)
packages/core/pluggableElementTypes/ViewType.ts	81.81% <ø> (ø)
packages/core/pluggableElementTypes/WidgetType.ts	81.81% <ø> (ø)
...re/pluggableElementTypes/models/baseTrackConfig.ts	58.33% <0.00%> (-2.54%)	⬇️
...ementTypes/renderers/ServerSideRenderedContent.tsx	0.00% <0.00%> (ø)
...entTypes/renderers/util/serializableFilterChain.ts	80.00% <ø> (ø)
packages/core/rpc/WebWorkerRpcDriver.ts	0.00% <0.00%> (ø)
packages/core/ui/Drawer.js	100.00% <ø> (ø)
... and 481 more

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[teresam856]

LGTM

[teresam856]

lgtm