libcamera: stream: Rename StillCaptureRaw to Raw

With the buffer copy removed from all pipelines for raw capture
rename StillCaptureRaw to Raw to better describe the role.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/qcam/main_window.cpp

@@ -380,7 +380,7 @@ int MainWindow::startCapture()
 		break;
 	case 2:
 		if (roles[0] != StreamRole::Viewfinder ||
-		    roles[1] != StreamRole::StillCaptureRaw) {
+		    roles[1] != StreamRole::Raw) {
 			qWarning() << "Only viewfinder + raw supported for dual streams";
 			return -EINVAL;
 		}