Update repo override test

Fixes https://github.com/sbt/sbt/issues/5335

sbt/src/repo-override-test/dependency-management/default-resolvers/build.sbt

@@ -4,7 +4,6 @@ lazy val root = (project in file(".")).settings(
   autoScalaLibrary := false,
   check := {
     val ar = appResolvers.value.get
-    assert(!(ar exists { _.name == "jcenter" }))
     assert(!(ar exists { _.name == "public" }))
   }
 )

sbt/src/repo-override-test/repo.config

@@ -1,3 +1,3 @@
 [repositories]
   local
-  sonatype-oss-public: https://oss.sonatype.org/content/repositories/public/
+  jcenter: https://jcenter.bintray.com/