[wasm] Fix dedup support. (#80223)

The DedupAssembly argument to the MonoAOTCompiler task contains the
original file name but its being compared against the file name which
was copied into the aot-in directory.

src/tasks/AotCompilerTask/MonoAOTCompiler.cs

@@ -574,7 +574,7 @@ private PrecompileArguments GetPrecompileArgumentsFor(ITaskItem assemblyItem, st
         var aotAssembly = new TaskItem(assembly);
         var aotArgs = new List<string>();
         var processArgs = new List<string>();
-        bool isDedup = assembly == DedupAssembly;
+        bool isDedup = Path.GetFileName(assembly) == Path.GetFileName(DedupAssembly);
         List<ProxyFile> proxyFiles = new(capacity: 5);
 
         var a = assemblyItem.GetMetadata("AotArguments");