src/preferences: fixes break statement

* added break statement

Change-Id: I69125bd5af11e8a94b07a50601e6cebbace372d5
Reviewed-on: https://review.haiku-os.org/c/1298
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

src/preferences/bluetooth/BluetoothMain.cpp

@@ -86,6 +86,7 @@ BluetoothApplication::MessageReceived(BMessage* message)
 
 		default:
 			BApplication::MessageReceived(message);
+			break;
 	}
 }
 

src/preferences/printers/AddPrinterDialog.cpp

@@ -86,6 +86,7 @@ AddPrinterDialog::MessageReceived(BMessage* msg)
 
 		default:
 			Inherited::MessageReceived(msg);
+			break;
 	}
 }
 
@@ -403,4 +404,3 @@ AddPrinterDialog::_Update()
 
 	fTransport->SetEnabled(fPrinterText != "Preview");
 }
-