Clear SystemProperties set by QuarkusMainIntegrationTestExtension

Author: radcortez

test-framework/junit5/src/main/java/io/quarkus/test/junit/QuarkusMainIntegrationTestExtension.java

@@ -180,9 +180,7 @@ private ArtifactLauncher.LaunchResult doProcessStart(ExtensionContext context, S
                 return launcher.runToCompletion(args);
 
             } finally {
-
                 for (Map.Entry<String, String> i : old.entrySet()) {
-                    old.put(i.getKey(), System.getProperty(i.getKey()));
                     if (i.getValue() == null) {
                         System.clearProperty(i.getKey());
                     } else {