Make use_key_equivalents opt-in (#21662)

When revamping international keyboard shortcuts I wanted to make the
default to use key equivalents; in hindsight, this is not what people
expect.

Release Notes:

- (Breaking) In keymap.json `"use_layout_keys": true` is now the
default. If you want to opt-out of this behaviour, set
`"use_key_equivalents": true` to have keys mapped for your keyboard. See
[documentation](https://zed.dev/docs/key-bindings#non-qwerty-keyboards)

---------

Co-authored-by: Peter Tripp <peter@zed.dev>

crates/settings/src/keymap_file.rs

@@ -20,7 +20,7 @@ pub struct KeymapBlock {
     #[serde(default)]
     context: Option<String>,
     #[serde(default)]
-    use_layout_keys: Option<bool>,
+    use_key_equivalents: Option<bool>,
     bindings: BTreeMap<String, KeymapAction>,
 }
 
@@ -80,7 +80,7 @@ impl KeymapFile {
 
         for KeymapBlock {
             context,
-            use_layout_keys,
+            use_key_equivalents,
             bindings,
         } in self.0
         {
@@ -124,10 +124,10 @@ impl KeymapFile {
                             &keystroke,
                             action,
                             context.as_deref(),
-                            if use_layout_keys.unwrap_or_default() {
-                                None
-                            } else {
+                            if use_key_equivalents.unwrap_or_default() {
                                 key_equivalents.as_ref()
+                            } else {
+                                None
                             },
                         )
                     })