Fix annoyances with access control dialog

* Don't send database locked/unlocked messages when "search in all databases" is enabled
* After access control dialog closes, only hide main window on macOS, and then only if previously hidden.

src/browser/BrowserService.h

@@ -34,7 +34,6 @@ enum
     max_length = 16 * 1024
 };
 
-class DatabaseTabWidget;
 class DatabaseWidget;
 class BrowserHost;
 class BrowserAction;