tests: fixed wrongly replaced egrep
In this case, the usage of egrep was correct as it's the type of regex that the `find` command is using
@@ -14,7 +14,7 @@ command -v checkbashisms > /dev/null 2>&1 || {
cd "@CMAKE_SOURCE_DIR@" || exit
# Use (non-emacs) extended regex for GNU find or BSD find
-find -version > /dev/null 2>&1 > /dev/null && FIND='find scripts -regextype grep -E' || FIND='find -E scripts'
+find -version > /dev/null 2>&1 > /dev/null && FIND='find scripts -regextype egrep' || FIND='find -E scripts'
# - The scripts `reformat-c`, `reformat-java` and `install-config-file` use `command -v`,
# which was optional in POSIX until issue 7. Since `which` is not part of POSIX
