[Breakpad] Fix hex formatting for MinidumpCrashpadInfo::Print()

The hex formatting in MinidumpCrashpadInfo::Print() was missing
the leading 0, so byte values < 128 were not possible to decode.

Change-Id: Ib355bcdaf86e91d644045df645fb4fa75332aa4b
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/4571100
Reviewed-by: Joshua Peraza <jperaza@chromium.org>

src/processor/minidump.cc

@@ -5503,7 +5503,7 @@ void MinidumpCrashpadInfo::Print() {
         // Value represents something else.
         char buffer[3];
         for (const uint8_t& v : annot.value) {
-          snprintf(buffer, sizeof(buffer), "%X", v);
+          snprintf(buffer, sizeof(buffer), "%02X", v);
           str_value.append(buffer);
         }
       }