Fix pipeline build error (microsoft#3937)

This fixes the recent build errors in the pipelines. The compiler was
complaining about re-throwing an exception with `throw e;` instead of
`throw;`, which messes with the stack trace. Presumably it started
because of a tool update in the agents.

This also fixes a compilation error I'm seeing locally from a member not
being initialized.

src/AppInstallerRepositoryCore/CompositeSource.h

@@ -59,6 +59,6 @@ namespace AppInstaller::Repository
         Source m_installedSource;
         std::vector<Source> m_availableSources;
         SourceDetails m_details;
-        CompositeSearchBehavior m_searchBehavior;
+        CompositeSearchBehavior m_searchBehavior = CompositeSearchBehavior::Installed;
     };
 }

src/PowerShell/Microsoft.WinGet.Client.Engine/Helpers/AppxModuleHelper.cs

@@ -195,7 +195,7 @@ private void AddProvisionPackage(string releaseTag)
             catch (RuntimeException e)
             {
                 this.psCmdlet.WriteDebug($"Failed installing bundle via Add-AppxProvisionedPackage {e}");
-                throw e;
+                throw;
             }
         }
 
@@ -219,7 +219,7 @@ private void AddAppInstallerBundle(string releaseTag, bool downgrade)
             catch (RuntimeException e)
             {
                 this.psCmdlet.WriteDebug($"Failed installing bundle via Add-AppxPackage {e}");
-                throw e;
+                throw;
             }
         }
 
@@ -384,7 +384,7 @@ private void AddAppxPackageAsUri(string packageUri, IList<string> options = null
                 else
                 {
                     this.psCmdlet.WriteError(e.ErrorRecord);
-                    throw e;
+                    throw;
                 }
             }
         }