Fix BootZipCopyAction.Processor.getDirMode(FileCopyDetails)

See gh-46408

Signed-off-by: Johnny Lim <izeye@naver.com>

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootZipCopyAction.java

@@ -487,7 +487,7 @@ class BootZipCopyAction implements CopyAction {
 		}
 
 		private int getDirMode(FileCopyDetails details) {
-			return (BootZipCopyAction.this.fileMode != null) ? BootZipCopyAction.this.dirMode : getPermissions(details);
+			return (BootZipCopyAction.this.dirMode != null) ? BootZipCopyAction.this.dirMode : getPermissions(details);
 		}
 
 		private int getFileMode(FileCopyDetails details) {