Don't wait for LED blink on boot.

Previously 500 ms of the boot was spent on the "all ok" LED blink wait.
Now the LED is kept on for the duration of initialization + 100 ms.
Results in similar blink as before but cuts boot time by 400 ms.

src/ZuluSCSI.cpp

@@ -447,8 +447,9 @@ static void reinitSCSI()
   // Error if there are 0 image files
   if (scsiDiskCheckAnyImagesConfigured())
   {
-    // Ok, there is an image
-    blinkStatus(BLINK_STATUS_OK);
+    // Ok, there is an image, turn LED on for the time it takes to perform init
+    LED_ON();
+    delay(100);
   }
   else
   {
@@ -524,6 +525,9 @@ extern "C" void zuluscsi_setup(void)
       azplatform_disable_led();
     }
   }
+
+  // Counterpart for the LED_ON in reinitSCSI().
+  LED_OFF();
 }
 
 extern "C" void zuluscsi_main_loop(void)