legacy support: allow USE_ALT_DISPlAY as alias for USE_ALT_DISPLAY

just to prevent that existing user build envs stop working ... the difference between "L" and "l" is sometimes hard to see.

Author: softhack007

wled00/usermods_list.cpp

@@ -58,15 +58,15 @@
 #endif
 
 #ifdef USERMOD_FOUR_LINE_DISPLAY
-  #ifdef USE_ALT_DISPLAY
+  #if defined(USE_ALT_DISPLAY) || defined (USE_ALT_DISPlAY)
     #include "../usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h"
   #else
     #include "../usermods/usermod_v2_four_line_display/usermod_v2_four_line_display.h"
   #endif
 #endif
 
 #ifdef USERMOD_ROTARY_ENCODER_UI
-  #ifdef USE_ALT_DISPLAY
+  #if defined(USE_ALT_DISPLAY) || defined (USE_ALT_DISPlAY)
     #include "../usermods/usermod_v2_rotary_encoder_ui_ALT/usermod_v2_rotary_encoder_ui_ALT.h"
   #else
     #include "../usermods/usermod_v2_rotary_encoder_ui/usermod_v2_rotary_encoder_ui.h"