chore: Fix remaining clippy lints

src/backend/kms/mod.rs

@@ -747,7 +747,7 @@ impl KmsGuard<'_> {
                 .crtcs()
                 .iter()
                 .filter(|crtc| {
-                    device.inner.surfaces.get(crtc).is_none()
+                    !device.inner.surfaces.contains_key(crtc)
                     // TODO: We can't do this. See https://github.com/Smithay/smithay/pull/1820
                     //.is_some_and(|surface| surface.output.is_enabled())
                 })

src/backend/kms/surface/mod.rs

@@ -511,8 +511,10 @@ fn surface_thread(
     let egui = {
         let state =
             smithay_egui::EguiState::new(smithay::utils::Rectangle::from_size((400, 800).into()));
-        let mut visuals: egui::style::Visuals = Default::default();
-        visuals.window_shadow = egui::Shadow::NONE;
+        let visuals = egui::style::Visuals {
+            window_shadow: egui::Shadow::NONE,
+            ..Default::default()
+        };
         state.context().set_visuals(visuals);
         state
     };

src/backend/x11.rs

@@ -44,6 +44,7 @@ use tracing::{debug, error, info, warn};
 use super::render::{ScreenFilterStorage, init_shaders};
 
 #[derive(Debug)]
+#[allow(clippy::large_enum_variant)]
 enum Allocator {
     Gbm(GbmAllocator<DrmDeviceFd>),
     Vulkan(PhysicalDevice),