Use more conservative settings for the minimap display (#32878)

Follow-up of https://github.com/zed-industries/zed/pull/31390

Release Notes:

- N/A

assets/settings/default.json

@@ -403,10 +403,10 @@
     // Where to show the minimap in the editor.
     // This setting can take two values:
     // 1. Show the minimap on the focused editor only:
-    //    "active_editor"
+    //    "active_editor" (default)
     // 2. Show the minimap on all open editors:
-    //    "all_editors" (default)
-    "display_in": "all_editors",
+    //    "all_editors"
+    "display_in": "active_editor",
     // When to show the minimap thumb.
     // This setting can take two values:
     // 1. Show the minimap thumb if the mouse is over the minimap:

crates/editor/src/editor_settings.rs

@@ -218,9 +218,9 @@ pub enum ShowMinimap {
 #[serde(rename_all = "snake_case")]
 pub enum DisplayIn {
     /// Show on all open editors.
-    #[default]
     AllEditors,
     /// Show the minimap on the active editor only.
+    #[default]
     ActiveEditor,
 }
 
@@ -615,7 +615,7 @@ pub struct MinimapContent {
 
     /// Where to show the minimap in the editor.
     ///
-    /// Default: all_editors
+    /// Default: [`DisplayIn::ActiveEditor`]
     pub display_in: Option<DisplayIn>,
 
     /// When to show the minimap thumb.