fix(clients/windows): clippy's manual_is_multiple_of on the rescan tick

`cargo clippy -p punktfunk-client-windows -- -D warnings` fails on main with the
pinned 1.96.0 toolchain: `ticks % 5 == 0` trips `manual_is_multiple_of`. Pre-existing
and not from this branch — found while gating the launcher work on .173, because
neither macOS nor Linux ever compiles this crate.

Clippy's own suggestion, applied verbatim.

clients/windows/src/app/connect.rs

@@ -560,7 +560,7 @@ fn wake_and_connect(
                 None => {}
             }
             ticks += 1;
-            if ticks % 5 == 0 {
+            if ticks.is_multiple_of(5) {
                 rescan.request();
             }
             std::thread::sleep(Duration::from_secs(1));