Enable log colors for most of tools in /usr/bin

When emitting the calendarspec warning we want to see some color.
Follow-up for 04220fda5c.

Exceptions:
- systemctl, because it has a lot hand-crafted coloring
- tmpfiles, sysusers, stdio-bridge, etc, because they are also used in
  services and I'm not sure if this wouldn't mess up something.

src/path/path.c

@@ -171,6 +171,7 @@ static int parse_argv(int argc, char *argv[]) {
 static int run(int argc, char* argv[]) {
         int r;
 
+        log_show_color(true);
         log_parse_environment();
         log_open();