Fix scripted tests

src/sbt-test/sbt-sonatype/example/build.sbt

@@ -1,29 +1,16 @@
 organization := "org.xerial.example"
-
-enablePlugins(Sonatype)
-
 sonatypeProfileName := "org.xerial"
-
 publishMavenStyle := true
-
 licenses := Seq("APL2" -> url("http://www.apache.org/licenses/LICENSE-2.0.txt"))
-
 homepage := Some(url("https://github.com/xerial/sbt-sonatype"))
-
 scmInfo := Some(
   ScmInfo(
     url("https://github.com/xerial/sbt-sonatype"),
     "scm:git@github.com:xerial/sbt-sonatype.git"
   )
 )
-
 developers := List(
   Developer(id = "leo", name = "Taro L. Saito", email = "leo@xerial.org", url = url("http://xerial.org/leo"))
 )
+publishTo := sonatypePublishTo.value
 
-publishTo := Some(
-  if (isSnapshot.value)
-    Opts.resolver.sonatypeSnapshots
-  else
-    Opts.resolver.sonatypeStaging
-)

src/sbt-test/sbt-sonatype/operations/build.sbt

@@ -1,5 +1,3 @@
-enablePlugins(Sonatype)
-
 organization := System.getProperty("organization", "org.xerial.operations")
 sonatypeProfileName := System.getProperty("profile.name", "org.xerial")
 version := System.getProperty("version", "0.1")