fix: don't wait stale timeout

[knopki]

Clear event timeout if event already fired. This saves big amount of time in spank after all work is already done.

TImeout is set to 10000. Before:

➜ time spank
✔ Found matching config: Routify 2
✔ found user config: spank.config.js
✔ Inline dynamic imports
✔ Exported 7 pages in 916 ms
4.61user 0.14system 0:12.89elapsed 36%CPU (0avgtext+0avgdata 206348maxresident)k
0inputs+784outputs (0major+54695minor)pagefaults 0swaps

After:

➜ time spank
✔ Found matching config: Routify 2
✔ found user config: spank.config.js
✔ Inline dynamic imports
✔ Exported 7 pages in 890 ms
4.34user 0.14system 0:02.90elapsed 154%CPU (0avgtext+0avgdata 205408maxresident)k
0inputs+784outputs (0major+56510minor)pagefaults 0swaps

10 seconds faster.

[jakobrosenberg]

Thanks @knopki. Great catch!