UI: remove top bar

Change-Id: I9145fddff058f0b24f990b12b085208ccfe80a72
diff --git a/src/PreferencesWC.mm b/src/PreferencesWC.mm
index 8556ffe..057387b 100644
--- a/src/PreferencesWC.mm
+++ b/src/PreferencesWC.mm
@@ -57,6 +57,8 @@
     }
     [self.window.toolbar setSelectedItemIdentifier:kGeneralPrefsIdentifier];
     [self displayGeneral:nil];
+    NSToolbar *tb = [[self window] toolbar];
+    [tb setAllowsUserCustomization:NO];
 }
 
 -(id) initWithWindowNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil accountModel:( lrc::api::NewAccountModel*)accountModel dataTransferModel:( lrc::api::DataTransferModel*)dataTransferModel behaviourController:( lrc::api::BehaviorController*) behaviorController