Fix comment/code mismatch in position estimator weight factors

Comments incorrectly stated 0.3 when code uses 0.5f.
Updated comments to match actual implementation.

Author: sensei-hacker

src/main/navigation/navigation_pos_estimator.c

@@ -354,7 +354,7 @@ static bool gravityCalibrationComplete(void)
 static void updateIMUEstimationWeight(const float dt)
 {
     static float acc_clip_factor = 1.0f;
-    // If accelerometer measurement is clipped - drop the acc weight to 0.3
+    // If accelerometer measurement is clipped - drop the acc weight to 0.5
     // and gradually restore weight back to 1.0 over time
     if (accIsClipped()) {
         acc_clip_factor = 0.5f;