Don't overwrite request controls for libcamera 0.7

[ONLYA]

In the latest version of libcamera on Raspbian OS trixie (v0.7), the request control is not overwrittable any more. Therefore, the std::move should not be used, use controls().merge instead. As seen in the commit raspberrypi/rpicam-apps@5bf5f80 mentioned in the issue (raspberrypi/libcamera#329).

I would create a PR for this issue.

[ONLYA]

I do not know whether this would make version 0.4 or 0.5 not working, so the code would choose what to do based on the version.

[ONLYA]

If somebody else can check whether the proposed request control overwrite method works on the earlier version of libcamera, I will remove the version build flags in the code.