Fix DotNet Pack

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

We were missing config settings following the upgrade I did in #141

Successful packing has been tested and confirmed locally.

[codecov]

Codecov Report

Merging #142 (608c84f) into master (451da15) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   84.57%   84.64%   +0.07%     
==========================================
  Files          46       46              
  Lines        1368     1368              
  Branches      177      177              
==========================================
+ Hits         1157     1158       +1     
+ Misses        163      162       -1     
  Partials       48       48              

Flag	Coverage Δ
unittests	84.64% <ø> (+0.07%)	⬆️

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Impacted Files	Coverage Δ
.../ImageSharp.Web/Middleware/ImageSharpMiddleware.cs	88.25% <0.00%> (+0.37%)	⬆️

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