Correct native symbol upload and UUID.

The auto-detection of the UUID was missing the extra "0" added for
compatibility reasons.  The native upload also was sending malformed
HTTP.

Change-Id: I8c261fc525f0f0086f269f2dee02941dd55488cb
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2739320
Reviewed-by: Nelson Billing <nbilling@google.com>
Reviewed-by: Mark Mentovai <mark@chromium.org>