dev-java/openjdk-sts-bin: 13 version EOL, 14 fixes

Java 13 version support is now EOL:
https://www.oracle.com/java/technologies/java-se-support-roadmap.html
Fixed openjdk-sts-bin:14

Package-Manager: Portage-2.3.89, Repoman-2.3.20
Signed-off-by: Denis Reva <denis7774@gmail.com>

dev-java/openjdk-sts-bin/files/openjdk-sts-bin-13.env.sh

@@ -1,16 +0,0 @@
-# Copyright 1999-2020 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-VERSION="AdoptOpenJDK ${PV}"
-JAVA_HOME="${EPREFIX}/opt/${P}"
-JDK_HOME="${EPREFIX}/opt/${P}"
-JAVAC="\${JAVA_HOME}/bin/javac"
-PATH="\${JAVA_HOME}/bin"
-ROOTPATH="\${JAVA_HOME}/bin"
-LDPATH="\${JAVA_HOME}/lib/:\${JAVA_HOME}/lib/server/"
-MANPATH=""
-PROVIDES_TYPE="JDK JRE"
-PROVIDES_VERSION="${SLOT}"
-BOOTCLASSPATH=""
-GENERATION="2"
-ENV_VARS="JAVA_HOME JDK_HOME JAVAC PATH ROOTPATH LDPATH MANPATH"