Fix checkstyle violation in ImapMailReceiverTests

Author: artembilan

spring-integration-mail/src/test/java/org/springframework/integration/mail/ImapMailReceiverTests.java

@@ -109,7 +109,7 @@
 @DirtiesContext
 public class ImapMailReceiverTests {
 
-	private final static ImapSearchLoggingHandler imapSearches = new ImapSearchLoggingHandler();
+	private static final ImapSearchLoggingHandler imapSearches = new ImapSearchLoggingHandler();
 
 	private static GreenMail imapIdleServer;