gallivm: (trivial) fix int/uint border color clamping
gallivm: (trivial) fix int/uint border color clamping

Just a copy & paste error.
Fixes https://bugs.freedesktop.org/show_bug.cgi?id=68409.
Note that the test passing before probably simply means it doesn't verify
clamping of the border color itself as required by the OpenGL spec.

Reviewed-by: Jose Fonseca <61b5a29db2c0650f7c8510f93eece059c1b09320@vmware.com>

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