Fix available package list

[jthompson-arcus]

Closes #776

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.89%. Comparing base (df1813b) to head (67b7852).

Files	Patch %	Lines
R/app_server.R	55.55%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #808      +/-   ##
==========================================
- Coverage   81.91%   81.89%   -0.03%     
==========================================
  Files          36       36              
  Lines        6692     6698       +6     
==========================================
+ Hits         5482     5485       +3     
- Misses       1210     1213       +3     

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[jthompson-arcus]

This PR effectively changes the filters for available.packages() from the list R version, OS type, sub architecture, and duplicates to just duplicates in deployment. This means that R version, OS, and sub architecture where the application is deployed will not impact the list of packages available for upload.

[aclark02-arcus]

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