Added a new DatabaseWidget modal state.

Commit d8857bf4 attempted to fix currentMode() while the DB had not
yet been opened. However, the fix meant that the title bar always
displayed the state as being "locked". This change works around the
issue by introducing a new modal state for when the DB is not yet
open.

src/http/Service.cpp

@@ -76,6 +76,7 @@ bool Service::isDatabaseOpened() const
         switch(dbWidget->currentMode()) {
         case DatabaseWidget::None:
         case DatabaseWidget::LockedMode:
+        case DatabaseWidget::OpenMode:
             break;
 
         case DatabaseWidget::ViewMode:
@@ -93,6 +94,7 @@ bool Service::openDatabase()
         switch(dbWidget->currentMode()) {
         case DatabaseWidget::None:
         case DatabaseWidget::LockedMode:
+        case DatabaseWidget::OpenMode:
             break;
 
         case DatabaseWidget::ViewMode: