Reuse timer in Deadline

[paulwe]

before

BenchmarkDeadline/Set-10         	 1535445	       784.3 ns/op	     456 B/op	       6 allocs/op

after

BenchmarkDeadline/Set-10         	13248633	        79.64 ns/op	       0 B/op	       0 allocs/op

[codecov]

Codecov Report

Attention: Patch coverage is 90.32258% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 83.36%. Comparing base (d9ad54c) to head (e9bc06e).

Files	Patch %	Lines
deadline/deadline.go	90.00%	2 Missing and 1 partial ⚠️
deadline/timer_js.go	90.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
+ Coverage   83.24%   83.36%   +0.11%     
==========================================
  Files          38       40       +2     
  Lines        2734     2759      +25     
==========================================
+ Hits         2276     2300      +24     
- Misses        333      334       +1     
  Partials      125      125              

Flag	Coverage Δ
go	83.08% <90.62%> (+0.04%)	⬆️
wasm	65.44% <86.66%> (+0.21%)	⬆️

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[boks1971]

lgtm! But, would be good to get another pair of 👀 on this.

Amazing improvement in the benchmark!