pipewire: update customized SWB patch

This updates the patch so that it is formatted and can be applied with
`git am`.

BUG=b:304918269
TEST=Apply the patch, run the tests as described in README

Change-Id: Ie21b57a2f353aca6bf5671984c8214dd8bea66ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bluetooth/+/5028937
Commit-Queue: Jeremy Wu <jrwu@google.com>
Reviewed-by: Shyh-In Hwang <josephsih@chromium.org>
Tested-by: Jeremy Wu <jrwu@google.com>
Reviewed-by: Ying Hsu <yinghsu@chromium.org>