linux: Fix wrong keys are reported when using German layout (#31193)

Part of #31174

Because the keyboard layout parameter wasn’t set correctly, characters
don’t show up properly when using the German layout at launch.

To reproduce:
Switch to the German layout, launch Zed, and press the `7` key. it
should output `7`, but instead it outputs `è`.


Release Notes:

- N/A

crates/gpui/src/platform/linux/x11/client.rs

@@ -840,6 +840,14 @@ impl X11Client {
                         state.xkb_device_id,
                     )
                 };
+                let depressed_layout = xkb_state.serialize_layout(xkbc::STATE_LAYOUT_DEPRESSED);
+                let latched_layout = xkb_state.serialize_layout(xkbc::STATE_LAYOUT_LATCHED);
+                let locked_layout = xkb_state.serialize_layout(xkbc::ffi::XKB_STATE_LAYOUT_LOCKED);
+                state.previous_xkb_state = XKBStateNotiy {
+                    depressed_layout,
+                    latched_layout,
+                    locked_layout,
+                };
                 state.xkb = xkb_state;
             }
             Event::XkbStateNotify(event) => {