Use new Fedora queue (#9178)

Author: jkotalik

eng/targets/Helix.Common.props

@@ -20,7 +20,7 @@
         <HelixAvailibleTargetQueue Include="Debian.8.Amd64.Open" Platform="Linux" />
         <HelixAvailibleTargetQueue Include="Debian.9.Amd64.Open" Platform="Linux" />
         <HelixAvailibleTargetQueue Include="Redhat.7.Amd64.Open" Platform="Linux" />
-        <HelixAvailibleTargetQueue Include="Fedora.28.Amd64.Open" Platform="Linux" />
+        <HelixAvailibleTargetQueue Include="\(Fedora.28.Amd64\)ubuntu.1604.amd64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:fedora-28-helix-45b1fa2-20190402012449" Platform="Linux" />
 
         <!--  TODO: re-enable Debian.9.Arm64.Open and Ubuntu.1804.Arm64.Open    -->
     </ItemGroup>