Fix CompletionTest.importAnnotationAfterImport expectations

So, before my change, importing java.lang.annotation and then importing
"annotation" will return java.lang.annotation, but complete as
scala.annotation - so the completion logic (in scopeCompletions) is
wrong somewhere.  After my change they both return java.lang.annotation,
so looks like I might have unintentionally made that logic work for this
case - just need to update the test expectation.

Author: dwijnand

language-server/test/dotty/tools/languageserver/CompletionTest.scala

@@ -987,7 +987,7 @@ class CompletionTest {
 
   @Test def importAnnotationAfterImport : Unit =
     code"""import java.lang.annotation; import annot${m1}"""
-      .completion(("annotation", Module, "scala.annotation"))
+      .completion(("annotation", Module, "java.lang.annotation"))
 
   @Test def completeTemplateConstrArgType: Unit = {
     code"""import scala.concurrent.Future