🩹 Followup for lchar_t

Marlin/src/lcd/fontutils.cpp

 
 /* This function gets the character at the pstart position, interpreting UTF8 multibyte sequences
    and returns the pointer to the next character */
-const uint8_t* get_utf8_value_cb(const uint8_t *pstart, read_byte_cb_t cb_read_byte, wchar_t *pval) {
+const uint8_t* get_utf8_value_cb(const uint8_t *pstart, read_byte_cb_t cb_read_byte, lchar_t *pval) {
   uint32_t val = 0;
   const uint8_t *p = pstart;