tree-wide: spell "lifecycle" without hyphen everywhere

We had 2 more instances of unhyphentated spelling.

src/core/load-fragment.c

@@ -668,7 +668,7 @@ int config_parse_kill_mode(
         if (m == KILL_NONE)
                 log_syntax(unit, LOG_WARNING, filename, line, 0,
                            "Unit configured to use KillMode=none. "
-                           "This is unsafe, as it disables systemd's process life-cycle management for the service. "
+                           "This is unsafe, as it disables systemd's process lifecycle management for the service. "
                            "Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. "
                            "Support for KillMode=none is deprecated and will eventually be removed.");
 

src/login/pam_systemd.c

@@ -468,7 +468,7 @@ static bool validate_runtime_directory(pam_handle_t *handle, const char *path, u
         /* Some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually
          * set up properly for us. This is supposed to provide a careful safety net for supporting su/sudo
          * type transitions: in that case the UID changes, but the session and thus the user owning it
-         * doesn't change. Since the $XDG_RUNTIME_DIR life-cycle is bound to the session's user being logged
+         * doesn't change. Since the $XDG_RUNTIME_DIR lifecycle is bound to the session's user being logged
          * in at least once we should be particularly careful when setting the environment variable, since
          * otherwise we might end up setting $XDG_RUNTIME_DIR to some directory owned by the wrong user. */