Fix SyncLocalTimeToCamera call for latest Insta360 SDK

[paulfersi]

This PR fixes a build error caused by a mismatch between the current driver code and the latest Insta360 SDK API.

The SDK now defines:
bool SyncLocalTimeToCamera(uint64_t utc_time, uint32_t offset_time);

but the driver only passed a single argument, causing a compile-time failure.

This patch:

• Passes both required arguments
• Uses the current UNIX UTC time
• Sets the offset to 0 for UTC by default
• Fully restores compatibility with the latest SDK

Tested on:

• Ubuntu 22.04
• ROS2 Humble
• Latest Insta360 SDK (downloaded on 8 dec 2025)

[simbaforrest]

Thank you, @paulfersi
@Abanesjo can you do a quick review and merge the pull request after you confirm everything?