Fix two-pass configuration initialization in Configurator1Test (apache#3441)

Author: jethomas-tsi

log4j-core-test/src/test/java/org/apache/logging/log4j/core/config/Configurator1Test.java

@@ -460,7 +460,6 @@ void testRolling() {
 
         builder.add(builder.newRootLogger(Level.DEBUG).add(builder.newAppenderRef("rolling")));
         final Configuration config = builder.build();
-        config.initialize();
         assertNotNull(config.getAppender("rolling"), "No rolling file appender");
         assertEquals("RollingBuilder", config.getName(), "Unexpected Configuration");
         // Initialize the new configuration