includes: always use #import

import is an include which ensure unique inclusion
(ObjC feature)

Refs #67102

Change-Id: I16cd53c3ffcf1ab2d8f700025451c7951ed42dbf
diff --git a/PreferencesViewController.mm b/PreferencesViewController.mm
index adba648..f2bdde3 100644
--- a/PreferencesViewController.mm
+++ b/PreferencesViewController.mm
@@ -31,7 +31,7 @@
 
 #import <QuartzCore/QuartzCore.h>
 
-#include <accountmodel.h>
+#import <accountmodel.h>
 
 #import "AccountsVC.h"
 #import "GeneralPrefsVC.h"