Changed tooltip styles

Removed useless isdirty field in entry
When an app can't be saved on suspend, don't reopen it to avoid possible de-sync

ModernKeePass/ViewModels/GroupDetailVm.cs

@@ -43,7 +43,7 @@ namespace ModernKeePass.ViewModels
         public bool IsNotRoot => Database.RootGroupId != _group.Id;
 
         public IOrderedEnumerable<IGrouping<char, EntryVm>> EntriesZoomedOut => from e in Entries
-            group e by e.Title.Name.ToUpper().FirstOrDefault() into grp
+            group e by (e.Title.Value ?? string.Empty).ToUpper().FirstOrDefault() into grp
             orderby grp.Key
             select grp;