test: delayed_controls: Fixup tests after recent DelayedControls changes

The recent fixes applied to DelayedControls change the behavior of the
library. As such, the tests ended up failing as they relied on the old
behavior of the helper. Update the tests to account for the new behavior
and get the tests passing again.

Specifically, the following changes have been made for each test:

singleControlNoDelay():
- Add a call to reset() to initialise internal DelayedControls state
only after setting the control on the device.
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from 1 onwards, as we will never have a queue item at
frame 0, since the reset() handles that.

singleControlWithDelay():
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from 1 onwards, as we will never have a queue item at
frame 0, since the reset() handles that.

dualControlsWithDelay() and dualControlsMultiQueue():
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from (startOffset + 1) onwards, as we will never have a
queue item at frame startOffset.
- Use the max delay (2 in this case) to determine the expected result
value.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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