housekeeping: Make debugtype embedded.

Author: glennawatson

src/Directory.build.props

@@ -8,6 +8,7 @@
     <NoWarn>$(NoWarn);1591;1701;1702;1705;VSX1000</NoWarn>
     <Platform>AnyCPU</Platform>
     <IsTestProject>$(MSBuildProjectName.Contains('Tests'))</IsTestProject>
+    <DebugType>embedded</DebugType>
     <!-- Publish the repository URL in the built .nupkg (in the NuSpec <Repository> element) -->
     <PublishRepositoryUrl>true</PublishRepositoryUrl> 
     <!-- Embed source files that are not tracked by the source control manager in the PDB -->