package/sudo: fix SUDO_ENABLE_SUDO_GROUP_RULE following version bump

Since the version bump of sudo to 1.9.17p1 [1], the sed command in
SUDO_ENABLE_SUDO_GROUP_RULE no longer matches the the line in the
example sudoers file shipped with the sudo package. This is due to
upstream commit [2].

This commit fixes the regexp to match the new sudoers file.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/ee86844e632d5760355154ea4e928c9228f3dfd1
[2] https://github.com/sudo-project/sudo/commit/7c121ff8340c6fa551ba4997dde9d450cf74e40c

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
[Julien: add link to upstream commit introducing the issue]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/sudo/sudo.mk

@@ -73,7 +73,7 @@ define SUDO_USERS
 endef
 
 define SUDO_ENABLE_SUDO_GROUP_RULE
-	$(SED) '/^# \%sudo\tALL=(ALL:ALL) ALL/s/^# //' $(TARGET_DIR)/etc/sudoers
+	$(SED) '/^# \%sudo ALL=(ALL:ALL) ALL/s/^# //' $(TARGET_DIR)/etc/sudoers
 endef
 SUDO_POST_INSTALL_TARGET_HOOKS += SUDO_ENABLE_SUDO_GROUP_RULE