makefile - fix typo in HEADER_FILTER #181

Job	Run time
check / clang-checks	1m 32s
check / doxygen	52s
check / editor-config	4s
check / include-orders	2s
check / cppcheck / cppcheck-test	10s
build-os-matrix	1s
build (fedora:38) / build	1m 26s
build (oraclelinux:8) / build	1m 17s
build (oraclelinux:9) / build	1m 11s
build (rockylinux:9) / build	1m 9s
make-test (fedora:38) / make-test	2m 1s
make-test (oraclelinux:9) / make-test	1m 27s
make-test (rockylinux:9) / make-test	1m 24s
rpm-test (oraclelinux:9) / test	20s
make-test (oraclelinux:8) / make-test	1m 51s
rpm-test (oraclelinux:8) / test	37s
rpm-test (fedora:38) / test	37s
rpm-test (rockylinux:9) / test	15s
	16m 16s

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