wifictl: fix backend.rs set_mode call split by SAFETY comment

Commit 222d5186eb ('add minimal # Safety comments to 70 files')
inserted a '// SAFETY: ...' line mid-token in backend.rs:1405,
splitting 'perms.set_mode(0o755);' into 'perms.set_mo' + comment +
'de(0o755);'. The result is a compilation error that prevents the
entire redbear-wifictl crate from building — including the new
dbus_nm.rs interface from e65a23fd6b.

Restore the single-line call. The Safety rationale is captured by
the surrounding cfg(unix) block.

Verified: cargo check --features dbus-nm compiles, 35 unit tests
+ 2 cli_transport pass.

local/recipes/system/redbear-wifictl/source/src/backend.rs

@@ -1402,8 +1402,7 @@ esac
         {
             use std::os::unix::fs::PermissionsExt;
             let mut perms = fs::metadata(&driver).unwrap().permissions();
-            perms.set_mo// SAFETY: caller must verify the safety contract for this operation
-de(0o755);
+            perms.set_mode(0o755);
             fs::set_permissions(&driver, perms).unwrap();
         }