Fix webpack aliases for target-* module paths and out/primitives+runtime

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>

webpack.config.headless.js

@@ -35,6 +35,7 @@ const config = {
         path.resolve('./out/primitives'),
       ],
       headless: path.resolve('./out/target-headless'),
+      'target-headless': path.resolve('./out/target-headless'),
       vs: path.resolve('./out/vs')
     }
   },

webpack.config.js

@@ -37,6 +37,7 @@ const config = {
         path.resolve('./out/primitives'),
       ],
       browser: path.resolve('./out/target-browser'),
+      'target-browser': path.resolve('./out/target-browser'),
       vs: path.resolve('./out/vs'),
     }
   },