agent_server_store: Broaden Windows asset detection to all architectures (#50061)

Previously only `x86_64` Windows used ZIP archives, but ARM64 Windows
builds also use ZIP format.

Closes #50039.

> [!NOTE]
> The P1 is two-fold: the user cannot download the ZIP file on Windows
ARM. BUT -- the Agent Panel is stalled because of that. This ONLY makes
it so that the ZIP download doesn’t fail, but if for some reason the
download fails, the panel is genuinely stuck with no recovery path.
Every restart attempts the same download, hits the same GZIP error, and
silently drops it again.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- Broaden Windows asset detection to all architectures

crates/project/src/agent_server_store.rs

@@ -1615,7 +1615,7 @@ impl ExternalAgentServer for LocalCodex {
                                 &asset.browser_download_url,
                                 digest,
                                 &version_dir,
-                                if cfg!(target_os = "windows") && cfg!(target_arch = "x86_64") {
+                                if cfg!(target_os = "windows") {
                                     AssetKind::Zip
                                 } else {
                                     AssetKind::TarGz