Fix V -> B typo in lookup table for encoding Base64.

PiperOrigin-RevId: 615968363
Change-Id: I1dae697462afcae48442610b1fe4acab93b6d62d

src/engine/engine_util_misc.c

@@ -639,7 +639,7 @@ static uint32_t _decode(char ch) {
 // returns number of chars written in buf: 4 * [(ndata + 2) / 3] + 1
 size_t mju_encodeBase64(char* buf, const uint8_t* data, size_t ndata) {
   static const char *table =
-    "ABCDEFGHIJKLMNOPQRSTUBWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
   int i = 0, j = 0;