fix usage of variable #48

Job	Run time
Build cosmotop	4m 34s
Build plugin Linux x86_64	2m 31s
Build plugin MacOS x86_64	1m 8s
Build plugin FreeBSD x86_64	2m 46s
Build plugin MacOS aarch64	51s
Build plugin Linux aarch64	1m 11s
Build plugin FreeBSD aarch64	15m 8s
Build plugin NetBSD x86_64	3m 30s
Bundle plugins with cosmotop	41s
Check cosmotop.exe MacOS x86_64	14s
Check cosmotop.exe MacOS arm64	13s
Check cosmotop.exe Linux x86_64	18s
Check cosmotop.exe Windows x86_64	20s
Check cosmotop.exe FreeBSD x86_64	1m 55s
Check cosmotop.exe FreeBSD aarch64	2m 41s
Check cosmotop.exe NetBSD x86_64	1m 37s
Check cosmotop.exe OpenBSD x86_64	3m 6s
	42m 44s

Provide feedback