Simplify Timer.stop() #1233

Job	Run time
android	27m 13s
docs	36s
air-samples (4.0.5)	3m 2s
flash-samples	36s
air-samples (4.1.5)	2m 58s
html5-samples	1m 26s
ios	19m 35s
air-samples (4.2.5)	2m 35s
air-samples (4.3.1)	2m 45s
linux	13m 40s
macos	14m 49s
windows	14m 37s
package-haxelib	2m 33s
neko-samples (3.4.7, windows-latest)	41s
hashlinkc-samples (windows-latest)	1m 23s
neko-samples (3.4.7, ubuntu-20.04)	18s
hashlinkc-samples (ubuntu-20.04)	1m 35s
hashlink-samples (windows-latest)	44s
neko-samples (3.4.7, macos-12)	47s
hashlinkc-samples (macos-12)	2m 14s
hashlink-samples (ubuntu-20.04)	16s
neko-samples (4.2.5, windows-latest)	41s
hashlink-samples (macos-12)	47s
neko-samples (4.2.5, ubuntu-20.04)	16s
neko-samples (4.2.5, macos-12)	54s
notify	0s
	1h 57m 1s

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