Don't autosave unmodified buffers (#32626)

Closes https://github.com/zed-industries/zed/issues/12091

Proper redo of https://github.com/zed-industries/zed/pull/32603

Release Notes:

- Fixed formatting effects not triggered when saving unmodified
singleton buffers

---------

Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: Cole Miller <m@cole-miller.net>

crates/editor/src/editor_settings.rs

@@ -50,7 +50,6 @@ pub struct EditorSettings {
     pub diagnostics_max_severity: Option<DiagnosticSeverity>,
     pub inline_code_actions: bool,
     pub drag_and_drop_selection: bool,
-    pub save_non_dirty_buffers: bool,
 }
 
 #[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
@@ -503,12 +502,6 @@ pub struct EditorSettingsContent {
     ///
     /// Default: true
     pub drag_and_drop_selection: Option<bool>,
-
-    /// Whether to save singleton buffers that are not dirty.
-    /// This will "touch" the file and related tools enabled, e.g. formatters.
-    ///
-    /// Default: true
-    pub save_non_dirty_buffers: Option<bool>,
 }
 
 // Toolbar related settings