Typos in LCD_2in.c and LCD_2in_test.c

[pidd-wbiz]

Both LCD_2in.c and LCD_2in_test.c have

#include "LCD_2IN.h"

Which should be

#include "LCD_2in.h"

[yvs2014]

That typo with insensitive filenames is still there:

[ 59%] Building C object examples/CMakeFiles/examples.dir/LCD_2in_test.c.obj
/Pico/OLED-1.3/c/examples/LCD_2in_test.c:31:10: fatal error: LCD_2IN.h: No such file or directory
   31 | #include "LCD_2IN.h"