videorecorder: remove kpipewire import prefix
With this, it doesn't build against the Qt 6 version of kpipewire for me:
[ 70%] Building CXX object videorecorder/CMakeFiles/selenium-webdriver-at-spi-recorder.dir/main.cpp.o
/home/nate/kde/src/selenium-webdriver-at-spi/videorecorder/main.cpp:9:10: fatal error: KPipeWire/PipeWireRecord: No such file or directory
9 | #include <KPipeWire/PipeWireRecord>
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Not sure this is the right fix, but it does build for me now.