Fix missing pi offset after merge of cyberbotics#6417 (cyberbotics#6525)

* Fix missing pi offset after merge of cyberbotics#6417

* Remove parentheses from ternary operation

Co-authored-by: Olivier Michel <Olivier.Michel@cyberbotics.com>

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Co-authored-by: Olivier Michel <Olivier.Michel@cyberbotics.com>

Author: TonyWelte

src/webots/nodes/WbLidar.cpp

@@ -427,7 +427,8 @@ void WbLidar::updatePointCloud(int minWidth, int maxWidth) {
   const double dtheta = mIsActuallyRotating ? (-2 * M_PI / (double)resolution) : (-actualFieldOfView() / w);
   const double cosdTheta = cos(dtheta);
   const double sindTheta = sin(dtheta);
-  const double theta0 = mIsActuallyRotating ? (minWidth * dtheta) : (actualFieldOfView() / 2 + minWidth * dtheta + dtheta / 2);
+  const double theta0 =
+    mIsActuallyRotating ? minWidth * dtheta - M_PI : actualFieldOfView() / 2 + minWidth * dtheta + dtheta / 2;
   const double cosTheta0 = cos(theta0);
   const double sinTheta0 = sin(theta0);