Fixed typo.

[dlemstra]

Prerequisites

• I have written a descriptive pull-request title
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• I have provided test coverage for my change (where applicable)

Description

Defult => Default. And it looks like this also includes some newline fixes?

[codecov]

Codecov Report

Merging #583 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #583   +/-   ##
=======================================
  Coverage   88.78%   88.78%           
=======================================
  Files         853      853           
  Lines       36093    36093           
  Branches     2607     2607           
=======================================
  Hits        32045    32045           
  Misses       3272     3272           
  Partials      776      776

Impacted Files	Coverage Δ
tests/ImageSharp.Tests/ConfigurationTests.cs	100% <100%> (ø)	⬆️

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