fix universe packages

Signed-off-by: Richard Jones <richard@dagger.io>

pkg/universe.dagger.io/docker/build.cue

@@ -49,10 +49,8 @@ import (
 	// Execute copy operation
 	_copy: engine.#Copy & {
 		"input":    input.rootfs
-		"source": {
-			root: contents
-			path: source
-		}
+		"contents": contents
+		source:     source
 		"dest":     dest
 	}
 

pkg/universe.dagger.io/examples/changelog.com/lowlevel/main.cue

@@ -99,7 +99,7 @@ engine.#Plan & {
 
 		appImage: engine.#Copy & {
 			input:    runtimeImage.output
-			source: root: inputs.directories.app.contents
+			contents: inputs.directories.app.contents
 			dest:     "/app"
 		}