macos: when scheduling timer, schedule first call for later

we were running it immediately which is too soon: the empty
mux check would fire before some of the scheduled jobs would
have run and registered tabs/windows.

window/src/os/macos/connection.rs

@@ -120,7 +120,7 @@ impl ConnectionOps for Connection {
         let timer_ref = unsafe {
             CFRunLoopTimerCreate(
                 std::ptr::null(),
-                CFAbsoluteTimeGetCurrent(),
+                CFAbsoluteTimeGetCurrent() + secs_f64,
                 secs_f64,
                 0,
                 0,