deps: downgrade libadwaita feature flag to v1_1

Per maintainer review feedback. The bump to v1_2 in commit
a45e00e was unnecessary — none of the macOS menubar work uses
a libadwaita 1.2-only API (no AdwMessageDialog, AdwAboutWindow,
AdwBanner, etc.). Drop the floor back to v1.1 so distros and
flake users on slightly older libadwaita aren't pushed forward
just to run the GTK frontend.

Verified with cargo clean -p libadwaita followed by cargo check
-p lan-mouse-gtk: libadwaita rebuilds with v1_1 features only
and the workspace compiles, clippy-clean, tests passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lan-mouse-gtk/Cargo.toml

@@ -8,7 +8,7 @@ repository = "https://github.com/feschber/lan-mouse"
 
 [dependencies]
 gtk = { package = "gtk4", version = "0.9.0", features = ["v4_2"] }
-adw = { package = "libadwaita", version = "0.7.0", features = ["v1_2"] }
+adw = { package = "libadwaita", version = "0.7.0", features = ["v1_1"] }
 async-channel = { version = "2.1.1" }
 hostname = "0.4.0"
 log = "0.4.20"