JSR223InteropTest should not set ruby.home for other tests

Author: eregon

src/test/java/org/truffleruby/JSR223InteropTest.java

@@ -9,6 +9,7 @@
  */
 package org.truffleruby;
 
+import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.truffleruby.fixtures.FluidForce;
@@ -36,6 +37,11 @@ public void before() {
         System.setProperty("polyglot." + OptionsCatalog.HOME.getName(), System.getProperty("user.dir"));
     }
 
+    @After
+    public void after() {
+        System.clearProperty("polyglot." + OptionsCatalog.HOME.getName());
+    }
+
     @Test
     public void testVersion() {
         assertEquals(TruffleRuby.getEngineVersion(), new TruffleRubyScriptEngineFactory().getEngineVersion());