examples:fix build issue with adc example

Signed-off-by: Ajay Bhargav <[email protected]>

Author: ajaybhargav

examples/adc-example/platformio.ini

@@ -19,7 +19,7 @@ monitor_speed = 115200
 board = quectelmc60
 
 ; Debug env
-[env:quectel_mc60]
+[env:quectel_mc60_debug]
 board = quectelmc60
 build_type = debug
 debug_build_flags = -Os -g2