fix: remove Config::DeleteToTrash and Config::ConfiguredTrashFolder

`delete_to_trash` is an option that was added for Gmail
as Gmail archives the messages by default
when they are deleted over IMAP:
<https://github.com/chatmail/core/issues/3957>
(implemented in <https://github.com/chatmail/core/pull/3972>).

Closes <https://github.com/chatmail/core/issues/6444>.

src/config.rs

@@ -194,10 +194,6 @@ pub enum Config {
     #[strum(props(default = "0"))]
     DeleteDeviceAfter,
 
-    /// Move messages to the Trash folder instead of marking them "\Deleted". Overrides
-    /// `ProviderOptions::delete_to_trash`.
-    DeleteToTrash,
-
     /// The primary email address.
     ConfiguredAddr,
 
@@ -275,9 +271,6 @@ pub enum Config {
     /// Configured folder for chat messages.
     ConfiguredMvboxFolder,
 
-    /// Configured "Trash" folder.
-    ConfiguredTrashFolder,
-
     /// Unix timestamp of the last successful configuration.
     ConfiguredTimestamp,
 
@@ -696,7 +689,6 @@ impl Context {
             | Config::MdnsEnabled
             | Config::MvboxMove
             | Config::OnlyFetchMvbox
-            | Config::DeleteToTrash
             | Config::Configured
             | Config::Bot
             | Config::NotifyAboutWrongPw