Update openevse_wifi_v1 to support LED addon

Increase pixel length to enable additional pixel add-on boards.

Author: chris1howell

platformio.ini

@@ -236,7 +236,7 @@ src_build_flags =
   ${common.src_build_flags}
   ${common.debug_flags}
   -D NEO_PIXEL_PIN=17
-  -D NEO_PIXEL_LENGTH=2
+  -D NEO_PIXEL_LENGTH=14
   -D WIFI_PIXEL_NUMBER=1
   -D WIFI_BUTTON=0
   -D WIFI_BUTTON_PRESSED_STATE=LOW