pid1: remove dot from initial announcement

This line is so long, that the end is usually not visible on
the terminal. The dot looks out of place, and dropping it saves one
column for more interesting content.

src/core/main.c

@@ -1999,7 +1999,7 @@ static void log_execution_mode(bool *ret_first_boot) {
         if (arg_system) {
                 int v;
 
-                log_info("systemd " GIT_VERSION " running in %ssystem mode. (%s)",
+                log_info("systemd " GIT_VERSION " running in %ssystem mode (%s)",
                          arg_action == ACTION_TEST ? "test " : "",
                          systemd_features);