Extract java8 binary to the correct location

Fixes gh-15948

ci/images/setup.sh

@@ -16,20 +16,10 @@ curl https://raw.githubusercontent.com/spring-io/concourse-java-scripts/v0.0.2/c
 # JAVA
 ###########################################################
 JDK_URL=$( ./get-jdk-url.sh $1 )
-case "$1" in
-	java8)
-		 COMPONENTS=2
-	;;
-	java11)
-		 COMPONENTS=1
-	;;
-	*)
-		echo $"Unknown java version"
-		exit 1
-esac
+
 mkdir -p /opt/openjdk
 cd /opt/openjdk
-curl -L ${JDK_URL} | tar zx --strip-components=${COMPONENTS}
+curl -L ${JDK_URL} | tar zx --strip-components=1
 test -f /opt/openjdk/bin/java