Expand the MIN macro in mini_snprintf.h

The MIN macro is not defined in any of the included headers.
Since it's only used in one place, replace the use with the intended
expansion instead of defining MIN.

Signed-off-by: Dionna Glaze <dionnaglaze@google.com>

common/inc/internal/mini_snprintf.h

@@ -254,7 +254,7 @@ static inline int __vsnprintf(char* buf, size_t size, const char* fmt, va_list a
 
         total_len += len;
 
-        len = MIN(len, buf_remain);
+        len = len < buf_remain ? len : buf_remain;
         memcpy(buf_pos, str, len);
 
         buf_pos += len;