Removed missed DotConfiguration variable

Author: amaitland

NuGet/cef.redist.nuspec

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
   <metadata>
-    <id>cef.redist.$Platform$$DotConfiguration$</id>
+    <id>cef.redist.$Platform$</id>
     <version>$version$</version>
     <authors>The Chromium Embedded Framework Authors</authors>
     <owners>The CefSharp Authors</owners>