Unify all the hex digits used in the app

src_common/uint256.c

@@ -19,9 +19,10 @@
 
 #include <stdio.h>
 #include <string.h>
-#include "ethUstream.h" // INT256_LENGTH
 #include "uint256.h"
 #include "uint_common.h"
+#include "ethUstream.h" // INT256_LENGTH
+#include "ethUtils.h" // HEXDIGITS
 
 void readu256BE(const uint8_t *const buffer, uint256_t *const target) {
     readu128BE(buffer, &UPPER_P(target));