gpui_linux: split xkbcommon wayland/x11 features (#60834)

# Objective

When xkbcommon compiled with either wayland or x11 only, the current
manifests will prevent it from compiling, despite gpui is already
wayland/x11 seperated.

close #60943 

## Solution

Simple changes to manifests.

## Testing

```
 cargo tree -p gpui_platform --no-default-features --features {wayland,x11} -e features -i xkbcommon
```

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [ ] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [ ] Performance impact has been considered and is acceptable

Release Notes:

- N/A

Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/gpui_linux/Cargo.toml

@@ -27,7 +27,7 @@ wayland = [
     "wayland-protocols-plasma",
     "wayland-protocols-wlr",
     "filedescriptor",
-    "xkbcommon",
+    "xkbcommon/wayland",
     "open",
     "gpui/wayland",
 ]
@@ -37,7 +37,7 @@ x11 = [
 
     "as-raw-xcb-connection",
     "x11rb",
-    "xkbcommon",
+    "xkbcommon/x11",
     "xim",
     "x11-clipboard",
     "filedescriptor",
@@ -89,7 +89,7 @@ swash = { version = "0.2.6" }
 bitflags = { workspace = true, optional = true }
 filedescriptor = { version = "0.8.2", optional = true }
 open = { version = "5.2.0", optional = true }
-xkbcommon = { version = "0.8.0", features = ["wayland", "x11"], optional = true }
+xkbcommon = { version = "0.8.0", default-features = false, optional = true }
 
 # Screen capture
 scap = { workspace = true, optional = true }