tests/qtest: Raise the ide-test timeout

tests/qtest: Raise the ide-test timeout

The ide-test occasionally times out: on the system I run
vm-build-openbsd on, it usually takes about 18 seconds, but
occasionally hits the 60s timeout, likely when the host machine is
under heavy load.  I have also seen this test hit its time limit on
the s390x CI runner.

Double the timeout for this test so that it won't hit its timeout
even when the host is running more slowly than usual.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241015113705.239067-1-peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>