Massive spaces->tabs and trailing whitespace cleanup, hopefully for the last

time now I've configured emacs to make them displayed in really annoying
colours...

cmd-new-window.c

@@ -166,7 +166,7 @@ cmd_new_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if (!data->flag_detached) {
 		session_select(s, wl->idx);
 		server_redraw_session_group(s);
-	} else	
+	} else
 		server_status_session_group(s);
 
 	return (0);