reload: add missing flb_cf_destroy #8146

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	20m 20s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	20m 23s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	18m 17s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	17m 48s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	19m 14s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	18m 58s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	18m 44s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	18m 47s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	19m 11s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	18m 25s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	52m 42s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	18m 37s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	17m 53s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	18m 1s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	17m 38s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	13m 36s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	13m 52s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	14m 1s
Unit tests (matrix)	1s
	5h 56m 28s

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