fix(compiler): look for flat module resources using declaration module path (#15367)

`ngc` would look for flat module resources relative to the flat module index.
`ngc` now looks for flat module resources relative to the `.d.ts` file that declarates
the component.

Fixes #15221

PR Close #15367

packages/compiler/src/metadata_resolver.ts

@@ -1060,7 +1060,7 @@ function isValidType(value: any): boolean {
 export function componentModuleUrl(
     reflector: ɵReflectorReader, type: Type<any>, cmpMetadata: Component): string {
   if (type instanceof StaticSymbol) {
-    return type.filePath;
+    return reflector.resourceUri(type);
   }
 
   const moduleId = cmpMetadata.moduleId;