lib/lkp_pattern.rb: add parentheses for regexp to obtain the matching… #862

Job	Run time
test (2.0)	2m 28s
test-packages (centos/stream9)	5m 10s
test (2.5)	2m 41s
test-packages (fedora/39)	8m 15s
test (2.7)	2m 43s
test-packages (ubuntu/jammy)	1m 9s
test (3.2)	2m 26s
test-packages (debian/bookworm)	1m 23s
	26m 15s

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