Allow accel/gyro permissions as YouTube embed uses them (#4112)

Author: tunetheweb

src/server/feature_policy.py

@@ -1,8 +1,6 @@
 feature_policy = {
-    "accelerometer": "'none'",
     "camera": "'none'",
     "geolocation": "'none'",
-    "gyroscope": "'none'",
     "magnetometer": "'none'",
     "microphone": "'none'",
     "payment": "'none'",